Pinball machines are supposed to drain, that's how you make money from them. I've played it quite a bit, and I like it. It's a shooters game and I even thought the release code was pretty good. When the code matures and incorporates the modes better I think it will be one of sterns best recent machines.
I think the prison could have a different toy behind the door, like a vari-target someone in a different thread suggested. But in general, I have fun playing it, and like the challenge it provides with the harsh drains. Except the magnet drop SDTM, easily fixable with code.