Use this as a template:
Offense: #/10 (this is regarding dps, critical chance, critical damage, attack speed, etc.)
Defense: #/10 (this is regarding armor, resists, etc.)
Build: #/10 (this is regarding the skills build)
Badass: #/10 (self explanatory)
Critique: (the more thorough and detailed, the more it'll be appreciated)
EDIT: Guys, please don't ask for a critique without critiquing the guy before you. It's a "return the favor" kind of system.
EDIT 2: RETURN THY FAVOR TO THY BROTHER AKA DON'T SKIP PEOPLE
EDIT 3: It's been working really well so far. Try to stick to this. Otherwise if you're looking for a quick rating or quick comment use the "Rate The Barb Above You" threads.
For those that actually take the time to read the OP, I've added a few additional traits you may want to critique. Feel free to suggest others!
Name #/10 (the barb's name - not the blizzard account name)
Godliness #/10 (1/10 means already a god...10/10 means a god of gods (Zeus?))
Statwh0re #/10 (having one or more stats that is over the top)
Sexiness #/10 (depth diggers = male/female stripper, etc)
Frugalicious #/10 (the less you have of uber items that are known to be blatantly expensive and still be able to have a kickass barb the higher the number)