I've seen a bunch of typos myself, perhaps a few more than usual. I agree that it's a bit embarrassing for Blizzard and can be a little annoying if there's a typo in something that you see come up all the time. Other than that typos happen and given all the made up words that the game employs a spellchecker is probably more harm than good.
It's sloppy though. No doubt about that. They used to be pretty good about fixing them in beta if brought to someone's attention. Don't know if that happened this time around or not.
I'd advise everyone to chill out about it though. Many of them will get fixed with the next patch and going on about it as if it's some game-breaking thing is unseemly. Perspective, people.