Matchmaking is definitely better (or was when I revisited on consoled). I honestly never found the performance wanting - but also didn't try and play at 4K/60. Other than that they've done more than a few passes at the game for QoL and performance updates.
. . .I will say, the end-game that was in the base game, while fun, wasn't really something I wanted to go back to. It was honestly a slog both getting through enemies (alive), keeping a high pace (rewards are pegged to how fast you can complete missions) and doing this all on high world difficulties. What they have shown in the endgame trailer though makes it seem like the new endgame content will be a bit more what people expect out of this kind of stuff.
The price of the expansion though is. . .interesting.
