He does IMO, tend to overdo it sometimes. Not so much in the amount of swearing but the quality. Just earlier swearing rants are one thing that made him so popular with a lot of people. More recently and in the past sometimes, he attempted to recapture that magic and a lot of the time, the swearing seems a bit forced. Not all the time though. Either way, I really dig the guy. To me(I don't know about others) but streams of vulgarites can still be hilarious. Overall, the swearing is what part of made the character funny to a lot of people and the frustrated things you shout sometimes when you're losing a game.
I find a lot of different things funny and one of them is the fact that in modern times, swearing has become somewhat mundane or not as “taboo” I guess. Just that anyone can open up their mouth and just start cussing up a storm. Funny to me in the sense that it is done so casually sometimes and its not as big a deal anymore. Well I mean to some people it still is. AVGN is probably most famous for his invented obscenities. Ala “motherpussbucket”
Really it is probably a lot of younger fans that are still at that age where cussing=LOL. Older fans are a bit more constructive critical of his reviews. Whether it be “it wasn't as angry” or the swearing seemed forced or there weren't as many laughs. He does still ask the fans a lot of what they like to see. Me personally I enjoy his reviews, though I do recommend checking out his earlier videos. Or even check out his review of the new TMNT movie as himself where he doesn't swear. Either way, I think he's a very influential, multi talented guy. Check out his film making site.
-Zack