It's tough carrying the flag in Warsong Gulch or Twin Peaks, primarily due to the Focused Assault debuff which increases the damage you take when you pick up the flag -- but it's about to get a little tougher for tanks playing these rated battlegrounds. According to CM Lore, in rated battlegrounds tanks who carry the flag should be getting a bigger debuff -- 50% additional damage compared to the 20% others get. However, a bug is currently treating tanks just like everyone else, so expect a hotfix soon (no restarts required).
In addition to fixing debuff damage, there are plans to add the same kind of debuff system to orb carriers in rated Temple of Kotmogu and cart carriers in rated Deepwind Gorge. These changes will take effect next maintenance cycle.
All of these changes are for rated battlegrounds only, where they should make it a bit easier to take out enemy flag carriers -- and tougher to keep your own alive.