man this is hard. ive been to a lot of bad skateparks. some have horrible layouts, some just have unridable ground or bad maitenence and some are confusing to even know what the people who build it where thinking.
my local is absolute shit. but mainly cause of the ground. it's already a bad metal prefab but the ground has made it actually unskateable. it has been abandoned for like 10 years now.
that said Katwijk Skatepark has to be the worst ground i've personally seen at a skatepark. from the same perfab builders, just 10x bigger than my local. but the ground had turned to actual gravel and can pretty much only be used by bmx riders now. it is saved by having one of the best miniramps of the country tho.
no point showing any picture cause the problem lies in the ground, wich you cant really see
there was also a skatepark in Wateringen where the ground was made of big concrete tiles. but there were laid so uneven that there would be up to 5cm (2") hight difrences between some. good luck rolling over that.
the old Naaldwijk skatepark i used to go to school nearby was quite sad too. it was a fiberglass prefab, one bank really steep making it hard to skate. the low quarterpipe had the roll on plate missing and the surface was hanging loose. the big quarterpipe was partly burned and molten and had the coping missing only the mellow bank was decent. it was really anoying you would get these splinters when you fell on it.
but, the locals scene in that park was very active, building their own ramps to put there and trying to fix stuff. the missing coping rod replace by one of those wooden curtain rods. and the ground was concrete instead of blacktop, wich is was the only prefab park ive seen that had that. maybe its nostalgia, but i cant call it the worst. theres no good footage of it tho.
funny is that my hometown had the exact same prefab in the 90s but it got burned down completely. the Naaldwijk one lasted about 12~14 years longer.
all of these are just bad cause of lack of maintanance. and so theres 1000ths of others in my country that are leftovers of the 90's and ealry 00's prefab era.
after a lot of thinking, i remembered i once went to a skatepark that was actually unskateable for me. it was just a miniramp. chest hight, but it went completely vert. there is sadly no photos to be found it used to be on streetview but the pics got updated this year. as i doubt it has ever even been used by anyone. especially considering the same town had another park with a miniramp dat was normal.
so yeah, the old Maasland miniramp gotta win this one for me.
i do know of another park where i havn't been, so it doesn't count, but its worth a mention. just 2 prefab quarters put against eachother with no flat bottom and one quarter on the the other side going into the gras. found it on google maps when i was searching for a place to skate on a familiy reunion but i decided it wasnt worth bringing my board there. also dont know if its still exists. but this place is so in the middle of nowhere it wont surprise me they wont even spend money on removing it.
Kavel K the bowl is ok. but too mellow to pump properly. butthe street section is just too tiny. its like they designed it and then scaled it down to fit the space they had.
i think newer parks that are build badly make me sadder than the old ones. same goes for Vlaardingen and Maassluis skateparks. theyre both designed badly and build badly, making them a waste of money.