The sad reality is that as much as you can get into the "Monk vs Wizard" high-level pissing contest, it's not relevant, it's party vs monsters at low-to-mid levels, and traditionally, from my gaming experiences, monks simply suck here.
I think we all can agree combat manuversnare very difficult to pull off vs BBEGs, so all monk (and fighter) builds built on these without getting them for free have generally just wasted a lot of actions. If you disagree I'd be interested to be proven wrong, but even at low-to-mids NPCs are often very strong. At mids you start to get into casters who are also unnaturally strong (demons/devils).
At these levels where +5 whatever don't grow on trees, Monks have difficulty with AC. Given the potion of shield is imaginary, and simply "defending yourself" isn't helping the party, we'll say by 3rd a monk can have an AC of, say, 17-18 (+1 amulet/ring, pair of 16s in Dex/wis, being very generous). Their damage will be similarly mediocre (not comparable with any real weapon users till about 11th level), and their tricks will be far.
As a traditional buffer, I often feel compelled to overbite the monk just so he doesn't feel worthless; eatin up slots with mage armor and the like.
Now, I haven't seen a ton post-APG, i'm convinced it helped them get past the DR issue, but I still don't see these "get the Mage in the middle" battles occurring as often as you see (apparently?). Usually if the monk were to run into the middle in a large scale combat lots of people could converge on him; most monks aren't that stupid.
So where does that leave us? A roleless class which we all love but which looks much better in concept than in practice... I compare them to the much beloved but never really working Eldrich Knight. They can do OK, but in or out of combat they have many superior options.