My alliance is currently in round 5, about 1/2 wayto beat it to get that second hulkbuster cover. Which is awesome for me -- HB was my very first 4 star cover, and sadly was at 1/1/0 before this event despite playing for over a year. Now at least he's 2/1/0, soon to be 2/1/1 which is better than nothing!
I have to say I'm very happy the nodes aren't scaling. Keeping them at level 30 makes it easy to unlock the boss one again. I also enjoy the fact that if you don't have a character one one side, you can open it with someone from the other side. It's a nice change to having to wait even longer to play.
That said, bosses are taking longer now. Not more difficult (have yet to fall to Cap n friends yet), just more tankier. I seem to be doing well with Hulk as a lead, and some combination of BP, Blade, Luke Cage, and OBW
Draws from tokens have been meh. Bunch of 2 stars, the only 3 star being from a random Cap draw, Scarlet Witch, who I already have max covered (not leveled)