I'm playing undead as we speak, and boy are they awesome. The 4 ghouls can play the running and throwing game with their 7/3/3/7 statblock. The skellies and zombies are kinda naff, but with a mixture of them you can set up blocks and tackle larger enemies. The mummies you have to save to take down black orcs, trolls, ogres etc. Finally the whights seem to be your general all-rounders. I have one now who is as agile as and fast as a ghoul, the toughest guy on my team, and the second strongest next to the mummy.
I think they're the de facto choice for powergamers and rookies. The ghouls provide speed and flexibility, along with wights, whilst the mummies are packing the punch. Zombies and skeletons provide cheap linemen types.
You also don't have to worry about injuries very much, as only the ghouls lack regenerate.
Meanwhile, I am enjoying milking snotlings for SPPs. You punch them and the green numbers start flying out like rings when sonic falls on a spike. 2 games against them provided most of the spp to skill ap about half my team to Level 2 or 3.
Granted, against the AI, but in 4 games played, ive won 3 2-0 and had a 1-1 draw. 2 games 2 2-0 wins vs ogres, a 2-0 win vs Khemri and a 1-1 draw vs amazons.
I guess the scores aren't really the key thing here, but in my opinion, Amazons are quite quick to skill up, due to team wide mobility (all players start with dodge), and have the ability to easily put an awful number of blodgers (block+dodge) on the pitch very quickly.
THis can make them a real handful, as you can only rarely knock them over.