I hate the Sharpshooter feat. I see a certain type of cheesy player drawn to SS, smugly doing massive damage from the safety of the back, but acting like you have it in for them when some high AC monsters teleport right next to them and they have to actually fight in melee, or when your NPC archers have SS and target them for return fire. GWM players at least know they are giving up a shield and are going to take their fair share of damage.
I can't say I find anything particularly annoying, but as a DM, I do live in constant fear that my super-villains will be polymorphed into something embarrassing.
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I currently run a political based campaigned where assassin and over throw of rulers and lords is a big part - all resurrection/raise dead spells make these sort of things harder to plan for...
Any of the conjure 112 pixie, squirrel, mephit, or manes spells (I am exaggerating the number, it only feels that high). I think it would have been more elegant to give them a swarm and have the size of the swarm increase with the level of spell cast (or summon a what amounts to a wall of angry mephitis/sprites/manes, and since the wall is pretty short, the party can range attack over it).