If you're split about it, Gurren Lagann is worth a watch. Don't be deterred by everyone saying it's not the best. There have definitely been way worse animes that I have sat through to the end that were nowhere near as
enjoyable as GL. And when it comes down to it, that should really be the final word. Enjoyability and content don't always match up. So what if you sit through something that doesn't land a place in your top 10? If you at least enjoyed it, you get to walk away with at least that experience :]
If you embark on Keroro Gunso and you end up liking it, you're in luck! I think there are 120-125 episodes and like 3 or 4 movies
I watched the first episode and thought it was pretty funny. It's one of those animes that a lot of shows make references to. Sort of reminds me of Guu/deluxe-- that kind of "what the? how'd
that happen" kind of anime.
On a last note, I just finished
Higurashi no Naku Koro ni and found it to be pretty good. Just started the second season,
Higurashi no Naku Koro ni Kai last night. I
really can't say anything about this without including spoilers so I wont divulge too much. It's a mystery/suspense anime done pretty well. As a cautionary warning, it might be too much to stomach for some people. There are some/a lot of literally
sadistic scenes including children. It ended sort of awkwardly, but it's probably just a segway into the second season. Check it out if you're into suspense/mystery