I remember I really liked it back when I was an edgy teenager lol. Since it was (and still is) pretty well liked in mainstream anime circles, it was a pretty good choice for someone who was just getting into the scene, like myself. Its one of the staple shows of the late 2000's, so even if the genre's not your cup of tea, I'd still recommend it as a part of "the culture".
I agree with Ohayotaku here. When I re-watched it recently, the characters felt a little flat to me. But if you're in it for the psychological chess-mind games, it certainly provides that. Kinda in line with Code Geass, but idk if other people feel that way too?