Rooster Teeth, no, Game Grumps, yes. I never really got into Red Vs Blue,and that seems to be the big Rooster Teeth thing. I really enjoy Game Grumps though. I started with Jontron, and was surprised when I ended up going onto a Danny episode. (But I had been watching Ninja Sex Party for ages, so I kind of knew who Danny Sexbang was.)
So essentially, I went from Jontron to “Wait, why is Danny Sexbang playing games with Ego Raptor.
So… I knew all three people, before I discovered their connection via Game Grumps.
RWBY is the other big rooster teeth thing.
Funhaus is owned by roosterteeth I think and has some pretty funny series like demodisk (NSFW) and weelhaus.
Also, rooster teeth has a gaming channel called “lets play” where they all play pretty rad games.