I liked blizzard alot more before the merger. Their older releases seem to be higher quality than their current crop. In no way does that mean their current games are bad. I love me my Starcraft II but I wasnt really a fan of Diablo 3 and WoW has never been my cup of tea either. So apart from starcraft the rest of blizzards current games are rather Meh when compared with their predecessors.
As for activision... I hate them. Worse than EA. All they ever do is milk franchises to death and release yearly sequels until its run into the ground. Guitar Hero, Call of Duty, Assassins Creed, etc etc. all of these games were amazing ideas and concepts at first but all of them got/get yearly updates and they got/are getting really stale.
Long Live SHIO!
