I like my Reavers (style reasons) though they really never do anything and their melee attacks are better than their range attacks... they can skirmish a little I guess but currently they‘re overpriced for what they do (which is nothing at all). They‘d need to hit on 3s to do anything ever.
as for thrall: Thralls are great though they tend to die in one go. Perhaps you should hol them back until turn 3, then charge all in (using several units of 10) and hope to massacre the enemy.
apart from that I never take more than units of 10 due to battleshock losses hurt quite a lot.
the eels rock, though the morsarr guard is overpriced COMPARED to the ishlean guard. The 4+ ignoring rend is just way better than the once per battle MWs. Ishlean also deal damage in a way more consistent manner than their brethren (in my experience)
the leviadon is just all around great. =}
allopexes: they seem lackluster to me. Both the ranged attacks and the melee weapons seem lackluster for their points. They‘re really thematic though.
our heroes are fine except for the Soulscryer which is also lackluster (give him sth. He can fight with...his ability is fine and all but there‘s really not much to him)