Nemesis Mode Less Than Stellar
Personally I think the mode sounded good as a concept, but in practice it bombed. Most of the time you end up with a bunch of mismatched champions, and people complaining about you giving the enemy a decent champ. The mode itself is inherently toxic with everyone trying to screw the other people over. Definitely not their best work I think.
Also the queue for it is absurdly long due to people always dropping at the last minute, just my experience.