The songs aren't as memorable, the story not as funny and picking at guitar strings just isn't as satisfying as spittin' rhymes in a rhythm game like this, but all that said, Um Jammer Lammy is a worthy sequel and a damn good time in its own right. It probably didn't leave a mark on me as much as Parappa the Rapper, because that game came along first and there was nothing else like it at the time. Um Jammer didn't have that fresh flavour and novelty factor to fall back on when it came out, maybe hence why it didn't sell anywhere near as well as PtR.

But if you look at the online discourse around the two games nowadays, it seems that folks heavily favour the riffing lamb over the rapping pup, so what do I know.