I will always contend that George Hill is the worst player I've ever seen at K-State. Canby would be up there too, Mawien is much better than those two.
I'm not convinced Mawien is any better than Canby at all, but Canby also never never played more than 15% of minutes. Mawien plays 43% of minutes, which is more than Justin Williams played. (Williams was pretty decent IIRC!)
The only player I can think of who played as much as Mawien and was as bad as him was
maybe Richie Terry. But even then I'm pretty sure Mawien is worse.