Blender has some pretty nifty rigging and animation features. Not better than Maya's but certainly much more flexible than Maya LT's, possibly better than Modo's too since it has NLAs and layering. Blender has bendy/stretchy IK, spline IK, constant volume constraint, mesh cage deformer like Pixar used to use back in the…
Because it doesn't support scripts and 3rd party plugins there's no auto rigging solution (like ACS). In a character heavy game, that could be a deal breaker.