I have just finished Might&Magic : Clash of Heroes
on PC, in a little more than 23h.
I know some people discarded that game as a "treason" to a somewhat "true" Might&Magic lore, one dating back before Ubisoft put its "dirty" hands on it. I can't disagree more. So far, Ubisoft's reboot of Might&Magic gave me nothing but excellent games: Dark Messiah of Might&Magic, Heroes of Might&Magic V and its add-ons, Might&Magic Heroes VI and this Might&Magic : Clash of Heroes.
Clash of Heroes is a puzzle game, but it doesn't lack in strategy, especially since the different campaigns will make you command to very different kind of units. You don't play the same way undeads and elves, demons or knights. Exactly like a "normal" Heroes of Might&Magic, in fact!
Okay, the character and units design is way more cartoonish than usually, but once again that's not a problem at all. In fact, it suits that kind of game very well! Characters are interesting and the lore is truly connected to the rest of Ubi's Might&Magic universe.
So, yes, Might&Magic Clash of Heroes is definitely an excellent game!
My 2012 list, so far: http://www.gog.com/en/forum/general/games_finished_in_2012_1/post15