Skial is alright. They have a good point/rating system, good servers, etc. Though sometimes pretty bad players (as in hackers and spammers) do get on their servers.
However, I feel they don't necessary have enough servers. For example, I don't think skial have special gamemode servers (such as Medieval Mode, Super Smash Bros, and Dodgeball). I would love to play on servers with these more unique and special stuff as Skial servers myself.