I'm going to guess that a lot of people are going to come in here and tell you the stats and what exactly is going to happen with your samurai over the next few levels. They're probably right. Me, I'd stick with him, but that's partly because every party I've ever made has had a samurai in it. There are a couple of swords out there that make him a more potent fighter until his critical skill gets high enough, then you give him an enchanted wakizashi and the muramasa and let him go to town. The fighter with his berserk ability will do lots of nifty things, but the extra odd spell, and the occasional "<name> strikes with lightning speed and hits for x6...damage...damage...damage...damage...Instant Kill!!!" makes it worth it for me.
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