I actually play this pretty regularly with my friends these days! We tried our best to do a 5-man ranked team but unfortunately we didn't do a good job working on a actual team and then after multiple losses it kinda fell through.
I mainly play support since it's the easiest way to get into games quick and recently just hit Legend 1!
I do enjoy also playing AD, again, building support style heroes since cores is more common. What roles do you play?
I haven't really watched competitive DOTA, where do you watch it?