yeah its not worth installing for anything more than a novelty. The games run so slow they are just not playable. If you are looking for some quick cheap games try getjar.com for some free java games or RIM's mobile website.
Personally I guess an emulator for BlackBerry devices is not coming out soon. It may be that running an emulator in an already emulated java environment just kills performance. Maybe we can beg the good guys at Magmic??? All i truly want is some Mario action on my curve