if im a mind flayer, a creature class, i get these racial type powers, maybe i get psionics, maybe i can levitate,
i get a physical form that gives me various resistances,
but then d&d comes in and tries to pin a class on this,
there is no class for this, its a monster class, the mind-flayer did not go through training school,
they give you x amount of hitdice, that's it.

with that much making sense,

why can't i just roll up a human, with no class. why do you have to railroad me into believing that i need a past profession or training to excel or exceed in a fantasy simulation..
the problem i have with classes, is that once i choose a class, then it takes away the option for all the other classes,

its kind of stupid really.
id like to see a class system more like oblivion elder scrolls 4, where there is no real class, its just a name, you get a series of stats and abilities that define your character,

on your end, in your computer environment, you can create any unit to have any ability or stat that you want. they can be infinitely powerful, it doesn't have to follow any kind of class rule system.
then you introduce class systems, you do nothing but NERF the player with that. while the monster npcs don't have to follow that rule, its kind of annoying.
every character essentially wants to be good at everything. lets face it that's a fact.

a better d&d system than classes, is you have a point-based buy system. you want to be proficient in light armor , then that costs 1 point, then you want to be proficient in medium armor 1 pt more,
then you want a basic array of weapons simple weapons 1 pt more again, you want to have access to x spells, that costs points,
then your total of stats and abilities that you bought with the point buy system, reflects what kind of character you are.

in d&d say im playing a cleric im a big healer right, but i go through this dungeon, never use 1 heal spell, and i kill 50 goblins with my mace, and boom im level 2, now im a better healer than previously !!
i like maybe skyrim better, i use a conjuration spell over and over, then my conjuration skill goes up. simple right ?