I never watched him, decided to start watching him a year ago and almost immediately stopped. His videos are just awful and make absolutely no sense nor they're interesting nor they teach you anything. I'd rather waste my time on something useful instead of this.
he used to not be that bad, but now his videos just lack good jokes and are just screaming and immature things. i mean, as of now the only sm64 thing is mario and a few other sm64 things, else its purely gmod.
Eh it's about 30% cursing, 10% other inappropriate stuff, 2% actually funny stuff, and I don't even know what the other 68% is. Not really very enjoyable.
It's definitely not a show for everyone. It's a machinma (don't quite know how to spell it) similar to Half Life Full Life Consequences or MegaMan65's old videos that heavily relies on quirky and goofy animations. If you do like Machinmas then SMG4 is the show for you.