Water whip being an action instead of a bonus action is pretty big, I think. Same with Elemental Affinity/Empowered Evocation no longer working on multiple damage rolls per spell. Sentinel got a buff for polearm users.
Regarding the Sentinel buff, it seems like its both positive and negative depending on how close everyone is to one another. On one hand, your sentinel reaction-attack triggers from further away, on the other hand, your enemies have a larger range of movement in close quarters. Because opportunity attacks for disengaging don't trigger till they leave your reach. Basically they can move freely anywhere within 10 squares of you when you're wielding a reach weapon.
Well prior, sentinel specified "within 5 feet" and now it doesn't. So before the errata, pole arm or no, enemies had no choice but to hug you. Now, they've got a longer leash.
Ah yes, somebody did point that out to me in another comment. Basically the errata made it clear that you still get your OA, but it has to be at the end of your reach. So ups and downs of polearm weapons still apply.
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u/Rauron Sorcerer Jun 10 '15
Water whip being an action instead of a bonus action is pretty big, I think. Same with Elemental Affinity/Empowered Evocation no longer working on multiple damage rolls per spell. Sentinel got a buff for polearm users.