For me the maps were a bit variable (and not just because of the randomiser's effect on their contents!).
I really actually enjoyed Konig's map - and found all the secrets - although there's definitely some difficult combat in there. Greenwood's map is, in a sense, the most straightforward, but I did like the non-linearity and the little bits of map design where you can see other parts of the solution from any given part.
spoot and riktoi's maps are, I felt, much harder than the above two are (at least, on skill 0) - I basically only survived the initial bits of spoot's map by running desperately through sections until I found somewhere I could hide (and I can't do the final section of it without godmode); riktoi's map obviously has allowances for skill 0 (there's a message that implies one enemy in a puzzle room is significantly worse on higher skills), but there's some tricky jumps and a puzzle which is punitive due to it not resetting if you get it wrong partway through (which I eventually no-clipped).
rabbit's map... I can't do enough of to tell you what I think of. (I'm at ~5 kills and there's a jump I guess I'm supposed to be able to make, but...). I think the start is a bit... intense... for skill 0 tbh.
4/5 although that's partly because Konig's map put me in a good mood.