Finished Rainbow, Claymore and Btooom in the last month.
Rainbow was an emotional masterpiece. They should make more anime like this, with a unique concept and a realistic plot.
Claymore was 'meh'. The story had a good way to go, but the Super Saiyan-like transformations in the end ruined it for me.
Btooom was fun. The opening is catchy and the concept, though not quite original, was displayed nicely.
Started watching Monster now. I was half-done with the manga ages ago and I already know just what kind of a masterpiece this series is.
Expecting to see some awesome ending.