i52 had some of the best tf2. both mixup and froyotech flew out from america. team iM returned with a better roster. all the games were super close, up until the finals where froyotech won pretty convincingly.
the i49 documentary came out and it was incredible - so much better (and longer) than the i46 movie
right now, the top 3 invite teams (froyo/mixup/xts) all seem to be around the same level
xts have definitely shown that mixup/froyo aren't at an untouchable level which is refreshing to see
a month or two ago, demoman had a huge nerf where stickies had ramp up damage, which caused everyone to complain on the forums for 10 pgs+. valve changed it back to normal a few days after