The raspberry pi is incredibly underpowered and struggles terribly to run even an ancient mame version and has framerate problems with almost everything unless it is overclocked. The guys on the BYOAC forums have been obsessed with running mame on this little turd since long before it came out, even though there is almost no application in which it would make any sense.
The cabinet this is in would easily fit something that was actually capable of running the games at a proper framerate and wasn't running through 2 levels of video adapters only to produce a picture that doesn't fill up the screen. A PC found in a dumpster would do this better and could leave out a few of the other components they had to buy in order to use that turd.