Why I suspect some DM's hate power attack
There are a significant number of responses saying mixed feelings and dislike. I think that the reasons that DM's dislike power attack have a lot less to do with Tweets findings than it does the 2-for-1 on a 2 handed weapon.
Many Dm's prefer to keep their games in a sweet spot between levels 5 and 12. Within the rules as written, a character with 18 Str can use a 2 handed weapon and hit for something like 1d12+6. Adding in a power attack with a +5 bab, and that character can hit for 1d12+16, which is an overpowering amount of damage for that level range. The attack bonus from Strength, Weapon focus, buff spells and weapon enchantments make the character a reasonable threat to score hits against most CR appropriate AC's, while able to score way more damage than most CR appropriate opponents can sustain.
Any Dm that likes low to mid level play has probably ran into problems when balancing a specifically tweaked high strength fighter. Those problems can be vexing, but they are a known issue. Groups that do not like that style of play will just avoid that problem. Groups that do not mind or like that style of play know how to work around it. But the 2 for 1 power attack will exaggerate the benefits of a strength focused build.
I suppose there are also a subset of people who do not mind the mechanic, but do not like how it applies to light weapons. Or the secondary subset that do not like it being uncapped.
(Personally, I never understood why combat expertise has a cap, but power attack does not).
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