I don't have anything against people playing Heroes single, I just don't see a point considering how much more fun the multi/hot-seat is. But there are some really good fan-made single-player maps, yes.
Playing a lot versus AI also explains why you might think that tower or dungeon is better than necro
Also remember that difficulty level matters
a lot, especially in case of factions that are expensive and/or shit at creeping. That is, if you play on impossible, as you probably should (excluding S-map deathmatches that end very quickly).
Malakal said:
Tower is the best, with three ranged creatures and two flying? Insane for castle combat. Also overall good spells, library and good heroes. And gremlin rushing to stop them pesky necros if need be.
I like Tower, but I'm afraid that shit heroes and lack of strong flying unit (though gargoyles are actually ok, especially early) are two of their three main cons, the last and most important one of course being how ridiculously overpriced they are. Fortunately for them thanks to gremlins and gargoyles they gain terrain very quickly, but still, when you go past golems the prices will hurt you badly on impossible.
Suicidal said:
Compared to how overpowered Necros are in HoMM 5 in HoMM 3 they seem rather balanced.
Really? I didn't play H5 much, but from what I've seen and heard from my friend, who is one of the better H5 players in Poland, they are very mediocre and only looking really dangerous on smaller maps.
Them being more overpowered than in H3 would be pretty strange, considering that H5 is definitely best balanced from all the series.