I've always thought dark elves were pretty darn good as a team since they have people who can block even the toughest of opponents and are still quick and nimble.
Orcs are solid, but I think Lizardmen are better. Lizardmen can dish out the punishment pretty comparably, but they can play the running game a lot better if they need to, and I've always been a big proponent of adaptability as a really desirable quality. The skinks are FAST, and in conjunction with the Kroxigor and the Saurus Warriors, it seems like it's got the best of both worlds. Silibili, the star player Saurus, is pretty solid, too, although he's not as good as Varag Ghoul-Chewer.
Chaos can be a good team once it has developed, but to start off with no players with block is a nightmare. You can develop each player into specialists fairly easyand can also have mutations on advance rolls, which can help develop players further.
The chaos warriors start at ST 4 and the beastmen are ST 3 (4 if they blitz with horns), making it a nice bashy team (once you get block for everyone).
Tactics are usually cage and fight until no one can fight back :wild:
Though with faster dodgy teams, you may have trouble trying to keep up.