DeeKayTripleDee says:
But my map placed second to dead last in this competition, thus proving that I'm not a good enough mapper
Hi! I've been making maps for this series of games for 17 years. I've probably made a couple hundred maps at this point and have won the MTC 8 times so far.
I
was dead last, so I obviously suck the most, I guess? (Or maybe this sort of thing is really complicated and somewhat arbitrary and doesn't necessarily mean much re: anyone's mapping skill.)
Don't let it bother you--take what you can from the feedback, and if it doesn't apply, ignore it.
Have fun. Make cool stuff. Make maps that you enjoy.
You're fine.