First of all, no, my version is not illegal, as I explained in a previous post, but yes, there are copy versions out as far as I know.
The comparison to Gothic 3 isn't really to that game alone, it's to place it between Oblivion and Gothic 3. Make no misstake, it's not as mindless as Oblivion, and the creatures/exploring feels much more like Gothic 3 than Oblivion, because there is actually danger around - no level scaling means you suddenly bump into things that will kill you in a single hit. In some aspects it is similar to Gothic 3, in others it is similar to Oblivion. It's somewhere inbetween.
@Moriendor:
Remember, I played an un-modded version of Oblivion. No extra quests or addons. The main quest itself is very short actually, as long as you use autotravel. No, I do not listen to the dialogue - I read it, and I read a whole lot faster than the dialogue is spoken.
And no, I do not run past creatures to do quests. In Two Worlds, that means very little experience, and I reached level 55 before I completed it. I'm guessing around 80-90 or so is the limit if you do absoluttely everything, but as I previously explained there is no reason to ever get that kind of level - I had maxed out all spellschools except necromancy + all passive combat skills and still had a 30 points left when I completed it (you don't only get skillpoints for levelling, you also get for certain quests, combos, defeating creatures etc).
As for dialogues in Oblivion. We're talking mindless, straightforward dialogue here. In a game like Gothic, I actually listen to every line, because they often have a meaning. In Oblivion it's completely pointless, all quests involve the exact same thing: Talk to questgiver, follow the arrow to the target, kill any hostiles in the area (if there are none, talk to all NPCs in the area) and then follow the arrow again. You could probably teach a monkey, small child or a very simple computer bot to get through Oblivion.
There is one element I skip in Oblivion that most people spend hours at - exploring. I spent the first few hours exploring, but soon realized that everything was scaled, and every dungeon only contained loot I could get anywhere else. After that I skipped exploring entirely and went straight for the quests. If you skip the exploration element in Oblivion, you'd be surprised at how short the game actually is.
Gothic 3 took me the longest of the three big freeroaming RPGs, due to the fairly high difficulty of quests and lots of interesting places to explore. Two Worlds comes in second, Oblivion third.
As a comparison, it still takes me about twice as long to complete Baldur's Gate 2 than Oblivion or Two Worlds, despite the fact that I skip most dialogues in BG2 nowadays since I know it all already. It's not a bigger game, but it's most definetly longer if you strip the freeroamers of exploration.
I completed Two Worlds very thoroughly, but as I explained, the main quest is very far from epic. Hopefully I won't spoil anyone when I say that the main quest is litteraly over before you know it. Pay attention to the sidequests and various factions. I have not maxed out all factions yet, but I intend to in my next playthrough.
Anyhow, this post became a whole lot longer than I expected. My point is simple, don't take this for Oblivion. There is a compass leading you to certain locations, but only if the questgiver knows the location already (i.e kill the guy at location X, but not if it's a find-out-for-me-quest).
One thing worth noting: Gothic 2 took me longer to complete the first time than any game since. The reason is quite simple - even though there are a lot of sidequests for people to do, they all lack depth. There are virtually no dialogue options other than yes/no, and very little info overall. As someone put it earlier in the thread - maybe it's time to focus a bit more on quality instead of quantity, because it's something Two Worlds suffer from just like G3 and Oblivion.
Edit: I had to add something. Why did you mention "replay" Moriendor? Oblivion is not a game you benefit anything from replaying in terms of speed through the game. In virtually every other game the speed would increase a lot, but I fail to see how it makes any difference in Oblivion, since every quest is so easy to complete you never actually have to stop and think about what to do next. You can pretty much just pick up all the quests in all major cities, and then start at the top of the list and follow the compass around untill you're out of quests. Voila, congratulations, you just completed Oblivion redicilously fast.