Isn't it the same company who designed both games?
When you browse SC2 forums there is nowhere near the insanity you find on Diablo 3's forum.
Atleast 80% of threads on Diablo 3 forums are troll threads and cursing the devs and blizzard day in and day out. lol
BTW someone who claimed to be a pro in SC2 told me that SC2 is a big disappointment to him due to the game being dumbed down for noobs and casual players.
And that its nothing compared to how awesome SC1 was. And it does not have the same magic that SC1 has.
Admittedly he is the only person I ever heard complained about SC2
I am currently on the starter edition trying my best to learn this game before I buy it so I won't waste my money but wow is RTS a hard genre I can't see how anyone can say this game is for noobs.