Forego imp disarm, majority of pvpers are smart enough to have weapon chain or immune gloves. Those who dont are gonna die before it wears off.
Put more points for armor or imp over power and imp charge.
If you are going sword and board, I recommend rocking a viskag and an elementals deck trinket. This will greatly increase your limited damage from attacks. Gear, stack crit, shield block value and stam then agil > str.
I run impale spec and pop off 1k+ shield slams on leather/cloth, 700+ on mail.
You can be affective, if you play your role correctly.
Make yourself hard to kill when time to push, last stand / shield wall and charge and fear. People will panic and target you while your ranged dps pick people off. While this is going on, imp shield bash healers, concus blow other healers.
AB after the initial BS push, you are best served as a point defender as you can stay alive long enough for renforcements to arrive.
Flag carry is so so, never can compete with a druid, but if no druid, swap to max hp gear and hope for quick dispells.
AV, you will carry teams, just keep pushing.