I take recommendations all the time. If a friend says it's good? I trust them and I'll try it out. Maybe not all the time, but why not? Also, if something is really popular and everyone loves it? I consider it kind of the same and I'll usually try it out then too. Sometimes I like it, sometimes I don't.
A lot of the anime I watch and the games I play are influenced like this. I usually don't branch out of my comfort zone (with games, anyway) unless something gets a ton of great reviews. I wouldn't have played Portal if it weren't so popular and it's definitely one of my favourite games. :x Likewise, I picked up God of War because I heard it was amazing and I couldn't stand it. Obviously the masses won't always agree with you, but it never hurts to try. Getting into something because it's popular isn't bad, per se, and honestly? The people who refuse to watch, play, or otherwise get into a game/anime/etc. just because it's popular bug me just as much as the people who get into things just to be liked for it. :/
On Gurren Lagann specifically... I really need to keep watching that. Two episodes isn't enough to form an opinion on it aside from "boooooooooobs". xD;