HoMM4 is good, I always replay it after a good round of HoMM3, simply because it is somewhat different than the others.
There is no reason for me to play HoMM1, 2 or 5 as long as I have 3 (it's simply superior in every way), but 4 has a different feeling.
I also like how the story ties in with the MM games, so I tend to play MM6, 7 and 8 combined with HoMM3 and 4. Good fun, takes months to do all that.
Edit: My two favourite campaigns are:
- Armageddon's Blade (HoMM3 add-on main campaign)
- The Price of Peace (Academy campaign of HoMM4, with Solymr and Emilia)
I love those campaigns!
There is no reason for me to play HoMM1, 2 or 5 as long as I have 3 (it's simply superior in every way), but 4 has a different feeling.
I also like how the story ties in with the MM games, so I tend to play MM6, 7 and 8 combined with HoMM3 and 4. Good fun, takes months to do all that.
Edit: My two favourite campaigns are:
- Armageddon's Blade (HoMM3 add-on main campaign)
- The Price of Peace (Academy campaign of HoMM4, with Solymr and Emilia)
I love those campaigns!