Jonathan Cooper hosts a Vimeo group gathering tons of game animation reels. You can find it here.
Animators of all skill levels are invited to share their reels.
Jonathan Cooper :
" PLEASE JOIN AND ADD YOUR OWN REEL
This group is open to animators of all skill levels, professional or otherwise.
To be included, videos should be demo reels primarily, (but not exclusively), featuring gameplay/cinematic animation, motion-capture and/or character rigging either from or in the style of video games.
Find more curated game animation content at gameanim.com"