All the monetising controversy aside, these maps are quite terrible.
The texture, lighting and brush work are all straight "This is my first custom map, made during summer break '96 :-)) find me at 46-(0)340-30021, cheers!!"
The "HD" textures are predictably horrific and look worse than anything in vanilla Quake 2. No thought went into the continuity of quality or style.
The gameplay isn't much better, it's very basic and unpolished. If these are your first maps then fair play to you, but you've got a long way to go.
Also Kmquake2 seems really bad. I've not used it before, but it's not very modern. Wouldn't it be better to optimise this for a more recent sourceport? Get rid of the stroke-inducing port/textures/effects/etc shitfire and go for a more polished approach (like what quakeulf does) and these maps won't be as bad.