Just finished watching Gurren Lagann and Sword Art Online (the first series) in the last month or so. Really enjoyed both.
I have to say though, that while Gurren Lagann was overall excellent (and I think my favourite anime, although considering I've seen like 5 that doesn't say too much) I thought it's ending/epilogue was rubbish. Meanwhile SWO was awesome as well but just became far too soppy/sappy at the half-way stage. I really could not abide Yui (the AI who the main characters treat as their child), I hated the way there was so much focus on the love story instead of the super cool fighting and explosions and shit, PLUS I was definitely not a fan of the slightly incestuous side-arc. Overall I'd give them a 9/10 and a 7/10 respectively.