maplestory.nexon.co.jp is a 10 character word. It can be bad or good length by depending on what kind of domain name for targeting audience.
Top Level Domain
maplestory.nexon.co.jp is still good but not best as same as .com. This is designed to target a specific country or audience. Remember that you can lose some web traffic to .com version of the domain because people tend to type .com more than any TLD.
maplestory is not a dictionary word but it contains dictionary words. Dictionary is most important to people because they will remember better without dictionary words. This domain is contained with map