Again, this is my tierlist and therefor my opinion through experience playing with those civs. I do agree with you that Korea is buggy, but a I still enjoy them.
For Belgium, they start off with outpost wagon, which can also be used for tradeposts. This is good because the more tradeposts you have, the weaker the opponents get. I like Belgium because of their constant supplying of Outposts, awesome TC cards, and those nice bicycles and elephants.
If you want, post your version of best to worst tierlist, just for comparison.
Bank Boom Baby!