The sounds need work. The models are superb. The US infantry uniforms need some re-weighting (their shoulders are enormous). The variety of weapons is good, and their vehicles pool is without peer at this point.
My only real complaint is they've implemented a custom armor system that I must admit works well with their assets, but doesn't play nice with non RHS content. So you're either using all RHS stuff, or you're not using them at all.
How much I like it? I spent something like 16 man hours making a mission exclusively for that content so I could have a decent armored fight. So yes, I rather like it.