You are giving me the reason, you said a lot of bad things that can happend and waht you got? Nothing, we spent a lot of time for nothing if you want to lose time you are free to do it but not me, why you cant just give me the reason?
Like I said, I get to make the stupid levels I always wanted to make for TF2, hopefully improve a map enough that it gets compliments (and feel validated I guess, lol). I don't exactly know how to make levels "fast" so I just relax, play some music, and work on part of the map. I just use it to chill, and I get to play wacky gimmick levels or well made custom maps. Even if they're not well made, at least I get some satisfaction from giving useful feedback. Hell, dare I say I find the experience "fun"?
You have to take the feedback you get into account. People have said that the map is "boring, flat, and too open". That
does not mean it cannot be improved upon. Your map does have some elements of height of course, but the rest of the map is entirely lacking. Adding some building that the cart moves through, for instance, would help split up some of that openness, and if you add a platform either inside of it or around the outside, it could create some height variation for interesting gameplay.
For instance, imagine what happens in Hightower (although it's not exactly a "good" plr map, it's more like a deathmatch map.). There are staircases that you can climb, platforms that you can shoot the cart from, a little hill in the middle of the map to split up sightlines- all of these make the map not so "boring", because then it makes subtle gameplay changes that although, in the grand scheme of things, doesn't seem like it makes such a difference, but it makes things a blast to play on.
Even adding little mounds of snow or dirt, maybe a few sheds or scattered boxes in strategic positions could make it seem more interesting and less flat. Not saying that you should toss crates every 10 feet, but thats the point of the creative process- you have to interpret the bizarre complaints and suggestions that you get in order to determine what needs fixing, and you'll need to make those changes with care.
It's not for everybody. I'm not sure if it's for me. But in any case, you will have to remain respectful towards other people.