I mean, we can definitely agree on some things here
1: 4 element monk is probably the worse subclass in the game (it's in the same groups as beastmaster and bezerker). It could (and should) be fixed, that is another discussion.
2: Monks are a bit "fixed" - not a lot of build option, and roleplay is a bit narrow - although hey, I had a pirate monk player.
3: Monks are fiddly. They require a lot of judgement and a bit of luck to work well. They are not tanks.
4: Monks DPR is not as high as DPR-optimized build.
I don't think any of these points are disputable yes?
The points of disputes are:
A: The monk does decent DPR, comparable to decent DPR dealers.
B: What the monk gains in control abilities, mobility and other powers is fair and useful compensation for not being a top DPR dealer or top tank.
From my personal experience, from running a campaign with one, then two (!!) monks from level 3-8, the answer to A and B is yes! (The campaign also had a paladin, a cleric of light and a warlock)