If /co/ virulently hates something that's widely popular, you should probably give it a chance and decide for yourself instead of just taking /co/'s word for it. Some of /co/'s gripes with R&M are legitimate, but the community here (insofar as it has one) never completely moved past the kneejerk "it's popular so it sucks (especially if Reddit likes it)" mindset, so you have to take that under consideration when you're looking at how /co/ reacts to any given show.
Not that "If /co/ hates it, it's worth a look" is a hard and fast rule or anything, but in R&M's case, it's certainly true. Give it a shot, see how you like it. If nothing else, there's a pretty funny spoof of the Avengers in season 3.