GL was good because it had Shinji who scored a more human Rei, was emo after Misato/Asuka hibrid, kicked some ass and then became a president. It was great fun until episode 17, ninja was sexy, megane-tan was sexy as well,and the hobo appears. Damn thing left me wanting a better closure, I hated the outfits at the end.
As for Haruhi and LS, honestly, I skipped about a few episodes, liked the mouthy session for the drummer/bass/yuki trio, the rest was kinda irritating for some reason, I mean if they need her to be happy why the hell do they send people who fall for her man?
LS was boring as hell, sure it had nice cameos, and I liked the first 6 or so endings in Karaoke bar, I still can't force myself to watch at least first episode though :).
So, out of the three, GL is the one with most relaxing story (no endless talk about why someone eats something that way and not the other lol), and fun protagonists (Viral, the guy at dai-gurren helm, others.
I will probably watch Haruhi when I get to it, but LS is not my cup of tea :).