Ghostbusters is a really boring game, with just a little of fan service. Visuals hiccups, environment poor of details, and to repetitive gameplay. If you can choose, should go on next-gen versions, this porting is very bad.
A mediocre port of a merely decent original entry, resulting in a functional but hardly enticing take on the series. PSP action fans are probably used to this second-class status by now, but this one's strictly for the franchise die-hards.