The most popular mediocre band to ever exist. They aren't amazing, but they aren't necessarily poor. They don't play too fast, but they never play too slow. Jerry Garcia's guitar playing is nowhere near prodigious, but he is good, and he can carry a jam. They're studio material isn't terrible, but it's not amazing, and it has never really changed or strayed to different genres or styles. They're live material is overbearing if you're not on acid, but some of it sounds really good.
In conclusion, they are the perfect 5/10.
I prefer more unstable music.