Giant Robo: 8/10
Amazing animation which makes references to older robot shows, the story would have been great if there wasn't so many plot twists
Breaking away from other mecha shows by being neither Super Robot or Real Robot, great action (especialy in EoE) mixed with good drama. Pity the characters tend to be unlikable, and the series ending was crap.
Gurren Lagann: 9.5
Great, stylized animation, great characters and extremely well directed. Manages to have a plot thats easy to follow, but also has deeper meanings if your willing to look hard enough.
Getter Robo Armageddon: 10/10
It has fucking Go Nagai directing it. Characters where insanely GAR and hotblooded before such things became popular.