I think some of these problems are solvable, if someone worked at it. The lack of gravitas of these creatures isn't in the pixels themselves, so to speak. They'

I think some of these problems are solvable, if someone worked at it. The lack of gravitas of these creatures isn't in the pixels themselves, so to speak. They're in the fact that large creatures fundamentally move differently than small ones. For a sample version of this, compare the "walk cycle" of a small dog to a large one. They aren't just scaled up. The problem is, you motion capture a normal sized person then try to linearly project their motion up to a 10 foot tall behemoth, and we can't help but see the normal-sized person underneath. The motion needs to change. Possibly something as simple as putting some weights of the right size in the right place on the motion captured actor would do the job.