For Seasons 1-3 of the BFC, here were the best players at their classes...
First Team
Grunt - Joshua333
Rocket - Rockethoe
Sniper - Parallel
Engineer - Destroyer*
Second Team
Grunt - Shotdown
Rocket - Detroit_Soul
Sniper - Kratos
Engineer - {Delta}
Third Team
Grunt - Axl
Rocket - Subzero
Sniper - ASAP
Engineer - Clonewolf