Still active Tom, did you play since Reaper of Souls? expansion totally changes my enjoyment of the game.
Some people are fully into the seasons others prefer to play the non seasonal game which has all the drops / benefits of the previous season.
For me the Seasons are a nice incentive to try a new class or spec, i enjoy levelling and the unique drops are reason enough for me to give it a try.
Theres no chance in hell of being competitive in the leaderboards due to the extreme nature of the people who tend to always find any exploit to get to the top first so if you ignore that and just play for fun you will love it.
OcUK clan still going although it tends to be the same people around most nights, and tends to get a spike with the start of each season, so if you have the game and expansion no reason not to check it out and shake off the cobwebs before S3