>>301671Mecha, like any subgenre, is just a matter of perspective. You liked Eva, right? Try Gunbuster, it's the same director as Eva and is similarly dense thematically, though much shorter. It also has a sequel, Diebuster, but it's radically different from the first one in most ways. Incidentally, Diebuster is from the same director as FLCL, so if you watch FLCL and like it, Diebuster may interest you too. You have to watch Gunbuster first though or most of the meaning in Diebuster will be lost.
Also, depending on why you liked Code Geass, Valvrave the Liberator might have what you're looking for.
Also that guy recommends Aquarion in every single anime rec thread regardless of how much it fits what OP is looking for. If you gave Gurren Lagann a 4 you probably won't like Aquarion or Shin Mazinger.