Too much Gurren Lagann and not enough Gunbuster. Gunbuster is not only the better series, but it's also only six episodes so you don't have to spend too much time on it, and it's still incredibly relevant despite being made in the late eighties. Also, you'll never really truly "get" Gurren Lagann or Evangelion if you haven't seen where it all came from, and pretty much most of the stuff Gainax has done can be traced back to Gunbuster.
Also it has a 250 meter tall robot doing alien armada crushing flying kicks, what more do you want?
Also, Magical Project S. If you want to understand the magical girl genre, watch this and not Madoka. Madoka's a good show, but it's not a very good representation of the genre as a whole. >.>
INAZUMMMMAAAA KIIIIICKKKKK
After you are done with Gunbuster, do not watch Gunbuster 2, it is not worth it, instead skip back to the currently running Rinne no Lagrange, AKA Gunbuster x Macross x Gundam.
Also, one of my choice watches for all years/all previous years seriously has to be Onegai Teacher, now this is a lighthearted, easy relax romance show between an alien teacher and a student (currently being copied to death/parallel story-telling by a similiar plot/character show called Ano Natsu). It has what I would call, for the first time in many anime I watched with a fresh and distinctive NOT in the city high school, a bunch of friends who gather for what I can only say not pretentious/some kinda generic sidekick/some kinda additional tsundere + a bunch of irrelevant characters friendship. It is a show where you can really like the characters for being natural as they were, somehow... it carried a different light hearted flavor quite unfounded in any of the romance/harem/dating sim based anime.
If you liked this I suppose the fan-servicey Onegai Twins is also worth a watch, but I don't like it as much as Onegai Teacher.
If we are talking about some oldie goldie, I think GTO the animation was considered one of the best in the old days, I would say it is entertaining and worth your time, although yes, the manga was clearly superior.
Are we talking about action?blood? gore?
I have heard no mention in this thread so far of HELLSING ULTIMATE - the OVAs , there is nothing to say here, just why are you NOT FUCKING WATCHING ALUCARD RAPE DEATH IN THE FACE AND THEN RAPE REALITY IN THE ASS TWICE is kinda like asking why not let's breathe carbon monoxide instead of oxygen. It is kinda a must.
Aside from this, I highly recommend catching up with Black Lagoon, both Roberta's trail and the original series; also Darker than Black AKA Chinese Electric Batman - The Show.