I love Arkham Asylum. Great story and so many nice touches, like the way Bats flares his cape out when he has fallen a greta distance and just about to land. SOme of those Riddler challenges are a bit tricky but none of them that hard. I learnt a lot about Batman Characters while doing them.
ANother good game there. Cool atmosphere, just a few control issues I found but wrangling and capturing Ghosts is awesome fun. There have been lots of Ghostbusters games over the years, so at less than 10gb I assume GB:The game and not the NES version then...