All over the board

I did not enjoy my experience in Korea. There are good and bad things I experienced (which I will lay out for you) but in my opinion the bad outweighed the good.

Good:
-Pay is good relative to living conditions, especially when you factor in the free rent. However, bill prices vary (whether you have gas or electric only, whether you have a "maintenance fee" for your apartment, etc) and there's nothing you can do about it as the school chooses the apartment for you. They also pay for your flight over and back and you get a bonus month's pay at the end and some countries can get the pension money back, all of which add up to a nice lump of cash at the end.
-If you live in a city, the social life is great. Bar hopping in Busan with my fellow waygooks always turned out to be a fun night out, as did the beach in the summer. I met some really awesome people who will be my friends for life.

Bad:
-This is not all Koreans, I'm sure, but many of them, especially the older generation, are VERY xenophobic towards anyone not Korean. Particularly towards anyone with dark skin, or Japanese people.
- Some people get excellent support at their schools, but I didn't. I was basically left to teach by myself most of the time (with elementary kids who spoke little to no english, including a pack of demonic 7 year olds that I came to just detest by the end of the year). There was little to no actual "co-teaching". Also, I basically had to beg to have help dealing with my landlady (who spoke 0 english), with banking issues, etc. My co-teacher usually helped me but she always seemed to do it begrudgingly and like it was a waste of her time.

Bottom line: if you can put up with people treating you like crap and being left alone with kids who don't respect anyone foreign, the pay is pretty good and the social life can be awesome. If you are someone with a low BS tolerance like me, the money and social life does not make up for it and you will be itching to get away by 6 months in.