@sgtPoultonHere are my pre 6.0.0 tiers
Tier 1
Assault: Zain (anti camping gadget + self heals after each kill)
Engineer: Liz (versatile launcher + can carry the extra explosives to finish the job)
Support: Falk (fastest revives and healing gun)
Recon: Casper (If I play recon I usually have to spot for my situational awareness challenged team, so the drone is great)
Tier 2
Assault: Mackay (sometimes you need an alternative path up a camper's rooftop)
Engineer: Crawford (for repairing and the alternative launchers)
Support: Irish (for the sentinel)
Recon: Rao (someone needs to get their vehicle hacked)
Never pick tier:
Angel (gutted)
Boris (gutted)
Sundance (gutted)