The animation was good. I especially liked the flip in the Tron test. The models themselves are good, but the textures shouldn't be so reflective. I noticed this in your second test. I think also increasing some render settings would work to get rid of the grain in the rendered images.

These look nice. Nice models and good use of DOF, etc. The materials are definitely excessively reflective, as others have mentioned. I also feel the walk cycle is stilted, it feels like the character pauses unnaturally between each step.

They were both really, really good but the first one had too much camera shake, I think.:)

The rest was really good at first I thought they were real Lego minifigures

Not bad at all! I really liked the the Tron inspired clip. My only problems with it was the slightly excessive and unnatural feeling camera shake, and the "fleshy" material on the head of the helmet-less guy. I can't put my finger on exactly what is wrong with it though. It may simply be to dull. The frames are a bit on the noisy side also, but I know how long Cycles can take to clean that up, so whatever. Pretty decent animation also. Not bad at all.