Vimeo is tiny at game related stuff (they don't even have that category there). Definitely not the place to search for Let's plays, walkthroughs, etc.
Dailymotion at least has that category, so it's not so bad.
Metacafe I won't even bother talking about =p
Unfortunately you can't compete with YouTube in content, it's insane how popular it got.
So yeah, it seems we are stuck with YouTube for a few more decades lol.
"Think twice before you speak, because your words and influence will plant the seed of either success or failure in the mind of another."