I tried and I disliked it :P
Too many crashes, too many "new features" I didn't really need. In fact I have played WoG only with 9th and 10th skill and commanders turned on, everything else was utter BS for me.
The only things I liked on it were the army XP (and their lowering with new units, that was a pretty good idea) and that some skills were upgraded, so they weren't worthless (for example scouting).

To be honest - when I heard about "King's Bounty: the Legend" and saw how it was supposed to look like, I could help the impression that they thought "Hey - let's make a HoMaM sequel and pretend we're just using the right to its predecessor, so we don't get sued !" ;).
One thing to note - the AI is... below average. It's the main issue everyone has with 5.
OTOH - it's great for multiplayer. There's a lot of interesting features, nice overall balance...
Getting back to single player - contrary to what was announced earlier - the campaigns are not that "noir" at all. Everything is cheesy and pompous as hell. I know it might be difficult to give a dark feel to a game with massive armies, but whenever I think that, I think of Starcraft. Not a fantasy setting, but still...
Yeah. I'd wait if I were you.

All of that was available in Heroes IV - and Heroes IV had even more good features. Plus, HoMM IV was easier to play - you had a clearer overview of the paths and positions of heroes/creatures, while in HoMM V it's all mushed up, thanks to Ubisoft's "wonderful" 3D engine.
Aw.... I hate you Ubisoft, for killing the franchise I loved the most.