Low level tanks (pre-tank stance) have a very hard time holding threat after the nerf

[Claymore65]

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I think you're misunderstanding a critical aspect of the "Tab Targeting" discussion here. People are not suggesting ONLY use tab targeting, and never use flash/overpower/unleash/etc. That would be an awful idea, and all of those abilities are extremely important.

However, you seem to have this odd idea that you should only be spamming flash, or at the very least your writing heavily implies that. The more common strategy is to start with a Shield Lob, flash somewhere between 1-3 times, then move into Tab targeting to maintain aggro. As a Paladin, this can be critical since you have so little AOE damage, and runs go much faster. Tab targeting lets you spread both damage and the higher enmity moves (such as Rage of Halone and Savage Blade) on a multiple targets. This will get you more enmity in the long run, and spread out damage. Obviously, this is all situational. If your DPS is all focusing on one enemy, you should be focusing on that enemy. If you have 7-8 mobs and everyone is (rightfully) going AOE crazy, spam flash/unleash/etc. Part of tanking is knowing what the best tool for the situation is. Sometimes, that will be AOE enmity moves, other times that will be tab targeting, and still other times you can just focus on a single enemy.

As for the main topic, I haven't experienced much change, at least when I was leveling Marauder and Dark Knight. Keeping aggro is about the same. If I'm significantly outgeared/outleveled, yeah, it can be difficult, but that's been true pretty much forever.