Sarevok is typically regarded as one of the better NPCs both for RP reasons and his excellent stats. But I seriously think he's a liability in combat.
The problem is that as a pure Fighter, he can't cast Stone/IronSkins. As getting hit is unavoidable in ToB, particularly with SCS, I have sometimes found it a struggle to keep him alive. Yes, he can dish out a lot of damage and has plenty of HP but his survivability is still limited. You could pick Hardiness a lot but that means less GWWs, which are useful for a 2h character.
I'm currently playing through ToB on Insanity with SCS and Item Revisions (among other mods). For this playthough, I Keepered Sarevok at the beginning to turn him into a Zerker/Mage. Having Stoneskin has made such a big difference. I'm really not sure how I would have kept him in one piece during the battles against SCS-improved demons dealing double damage if he was just a Fighter.
This has made me think that generally speaking, melee in ToB is suicidal for any build that can't cast Stone/IronSkins, with the possible exception of a Monk as their AC can become very low. I've read that the Zerker/Cleric is thought of as a good build but my experience with Sarevok makes me skeptical, particularly as that build won't even be getting Hardiness.
Or am I just doing it wrong?