I'm not a new player so maybe those comments have less of an impact on me. I don't think the mechanics back up your fears, but my fears and experience are not yours so I see things differently I;m sure.
I feel like they rely on a DM attempting to balance what they left hanging and the hints they left new DMs and player are exactly opposed to my POV
So what your afraid of is magic vs martial balance?
If I cannot trust that balance I am really not interested in the game as a whole SO sure.
However that is only part of it (I am aware he dps works out) but also sense of scale the characters do not feel "heroic" in scale that comment about harming more enemies with a low level hunter or monk daily or moderate level fighter one than a 5e fighter can do using all of its resources at high level was about characters being awesome and larger than life.
Note if martial types are insufficiently awesome in combat then I think if they are actually balanced casters are too although looking at the 5e fireball ummm sheesh.
It is not an issue for my group as we have very little magic, but this has definitely been discussed before. From a DPR perspective they classes are pretty balanced.
DPR is a necessary evil - lol.
I want the tactical choice feel. I do not get much out of a battlemasters once in a while ability to do something interesting when I could have taken any of the 4 phb, 4e martial classes and unless it was a simple ranger build (which definitely could work) and get more interesting options. Depleting HP is kind of boring. And tiny fights should remain inconsequential... and have to if the Hero character in Paragon is to be the one man army of Chainmail.
So I assume the issue you see is one or both of the following:
1) Too few non-magical options/too many magical class options. Definitely more magical options than I will ever use. However, I don't need a lot more than the fighter and the rogue for my martial options.
The 5e martial classes in function I find hard to be excited about. Its like they took the least interesting of 4e martial classes the twin striking ranger and went double down on it.
Personally I see no adequate Tactical Warlord nor a Defender Swordmage and till much later they didnt even have a valid Defender fighter in other words the things I liked most they removed.
I did have to homebrew a spell-less ranger though.
If skill use were more empowered you wouldn't need to an adaptable rogue or fighter actually should do the trick. But I really do not find 5e classes adaptable
You have to over write and build your own.