You have to consider that the game is made for consoles as well as PC. So the dialog choices you see are just short description of what the character intends to see. You simply don't have room to show all Shepard would say.
Some times the answers you see are ambiguous and if you didn't know which ones were paragon, neutral or renegade then you would complain. You want to play in a certain way and if you don't know the consequence of your reply then you will become frustrated. E. g. you wanted to solve the conflict peacefully, but since you didn't understand your dialog option you made something evil instead. That's even worse.
In Mass Effect 2 you know that the upper right choice is paragon, central right is neutral and lower right is renegade. Blue answers (left) are paragon and red answers (left) are renegade. I don't see a problem with that and would have hated the other method. If I can't see the entire dialog answer (like in Dragon Age) before I choose then I would like to know the intention between each answer before I select it. I don't think real people who want to follow the paragon path would doubt which option to choose. He would try to solve the issue in a paragon way.
I think Mass Effect 2 is an RPG game, but not the typical RPG that we're used to with Neverwinter Nights, Fallout and others. RPG means you're playing a ROLE and the choices you make have a consequence to the outcome of the story. You definitely see that in ME2. You can interact with people and what you say will mean something.
ME2 is somewhere between a shooter and aN RPG game. In typical RPG games you see that your stats, feats and skills will determine your chance to hit. In shooters it will be your own ability to point the gun and pull the trigger at the right moment. So ME2 combat works as a shooter while the ME1 combat worked as an RPG.
I actually like the merger between shooter and RPG in ME2. It works very well and I sometimes feel I'm playing a good shooter game with an excellent story. I like games like Modern Warfare, but the story is poorly executed. We're rushed from one mission to another and what we do won't influence the story at all. In ME2 you have the choice where to go next and how to solve the mission. So the game ends according to your choices even though you're pushed in the direction the game wants.
I hate games like Oblivion where you have no heavy story that would want to you pursue it. You're supposed to wander where you like and do the quests you want in any order. I don't like that kind of freedom because you don't get involved in the main conflict. So I never completed Oblivion. I got bored halfway through the game because I was tired of seeing the samey people, quests, dungeons etc. everywhere. I didn't feel what I did mattered to the story.
ME2 is definitely not a perfect game, but it's very good and I think they made it even better than ME1. The inventory system in ME1 and most RPG games are awful. You have a limit to the number of items you can carry and you collect junk to sell it and get money for better stuff. In almost all RPG's I played I spent a lot of time moving from a finished quest to a vendor to get rid of junk. It's so boring.
In ME2 you don't have any loot to worry about. You get paid for solving missions and you have no inventory. All you buy will be available in a weapons locker and you can select which to use at the beginning of each mission. That works much better and is similar to a shooter.
The worst part of ME2 was some story decisions. I thought it was cheesy that the entire squad mate group would go to the shuttle just to test the reaper IFF device. I would never have done that as a commander. This was done to let the Normandy be invaded by the collectors to kidnap the crew. I think it would have been better if the squad members you didn't use on a mission were also on the Normany so when you returned from a mission you would see your squad and crew kidnapped. That would create an even bigger reason to follow the collector ship into the Omega relay.
I saved the entire crew because I was finished with all my quests and moved into the Omega relay soon after the kidnapping, but I agree that you didn't get good indications that time mattered. If e. g. the AI computer would tell you that she had said the collector ship had moved through the Omega relay then you would have a reason to pursue.
I think that those who like ME2 the least are those who enjoy looting and getting new stuff all the time in their inventory. I play DA:O Awakening now and have already become tired of the numerous trips back to town to sell even more junk. I miss the ME2 system.
Team Corwin plays DDO and we spend maybe 20 minutes or so in real time in each 2 hour sessions travelling back and forth to the general vendor to sell loot and repair damaged stuff. That's not fun.
The thing I liked the least with ME2 was that almost every quest had to be resolved by killing some bad guys. So violence was the only way to solve it. I would have liked to have more non violent solutions to the quests. E. g. you could get somewhere and talk the bad guys to give up and get the hell out of there or force them to give you what you wanted.
The AI of bad guys is usually very poor. They fight until the last bad guy is dead. I think a smart bad guy would run away or even surrender if he saw you slaughtered most of his comrades without much effort. Why would a bad guy sacrifice his life if he has no chance of winning the battle? Monsters like husks won't have that kind of intelligence, but all sentient creatures would value their own lives and try to escape from a situation where they can win.
I've read somewhere that Bioware will focus more on the RPG part for ME3 so I have high hopes that ME3 will just be what I want.
A good combat engine (like a shooter), a great story and quests that can be solved in different ways and where my choices actually matter.