HEY!!!
There's a little term out there, "mixing it up"
Practical effects look better, simply because they are real. Did you see underworld? Zathurea? Doom? Some shots are fully animatronic suits, some are full CGI, some are a mix.
That duck and slide you were talking about?
Simple, green tights on the legs, and a smaller upper body suit. Add some CGI legs and it looks perfect. Theres a way around everything when it comes to practical effects, don't underestimate that.
About the grunts, watch LOTR again, the hobbets are as tall as everyone else. camera tricks and green screen. That solves that problem.
Hunters?
Same thing as the hobbits, only the other way around. Maybe a fully animatronic upper body for when they swing at people.
CGI does NOT look better, even the shots that win awards are fake as hell. (Gollum was a great stride, but you could easily tell he was CG.) That's why you can't have it alone.
did you post in said thread?