New library is absolute fucking garbage for the simple fact that there's no way to sort titles associated with someone else's library. I'm engaged in an unholy Steam-69 union with a buddy of mine and now all his shared games are just lumped into the same thing with zero way to filter games to just the shared library or just my own library. I can sort games by their tags on the store (Which is slightly cool) but they removed one piece of functionality I actually fucking used all the time. It also scrolls far, FAR worse than it used to (Noticeable chugging if you just roll the mousewheel down the list) and even functions worse if you click in the library and start typing a game's title to browse to it, since each game's page is "Fancier" which means there's more loading which means that tiny bit of chugging as you START typing means it fucks up and doesn't take you to the correct game once you finish typing. It's also noticeably worse if you want to look at recent news or recent updates for any given game, since you no longer have the "News" and "Recent updates" buttons. They show you some of the latest news on the page itself, but god help you if there's a wash of garbage posts and you're looking for some patch notes or something.
Edit: Looks like you can click the latest piece of news and then it sends you into an infinite scrolling hellscape, so even though it's more of a pain in the ass you can get older news that way at least.
Edit 2: God fucking damn it, there's no way to view your complete library if you also have stuff categorized, too. For example, I made categories for CYOA and board games since those are usually something I get in a vague mood to play a game of that type rather than going "Oh, I want to play Game Title Here" specifically. Previously you could view all and it'd show all your games regardless of category and then you could flip to categories as desired, but now the categorized games are always in their little ghettos now. Everything's terrible.
Edit 3: And what in the fuck does this mean? SO HELP ME GOD STEAM
Edit 4: Okay, that just means I'm filtering software/video/tools from the list. I was afraid it was doing something ungodly like blocking anime tagged games because I filtered anime from my store results, and if they started filtering shit I already owned I was going to go crazy. That's fine and dandy though.
Edit 5: Nice. Can filter and search your library with a lot of data from the store, but no sorting things by their Steam review scores. It'd be nice to filter to a certain genre and then sort by review scores to see what's the most immediately promising but no such luck.
Edit 6: Christ, the memory usage. 8 gigs was pretty fucking borderline already and now it's feeling worse now that Steam just got fucking bloated.