I agree with Kremmet. Any faction can have fun games against any other in a casual environment. If a certain model is causing issues for you or your spouse you can easily agree to not use that caster/beast/whatever until a later time. Also, if you are not doing it, I highly recommend using the scenarios from the Steamroller packet.
Edit: I have heard grumblings from Troll players that they struggle playing against Cryx. But, Trolls have evolved a lot as a faction with the last few books and because of that I do not think the Cryx match up is as bad for them as it once was.