1- I agree what did you say about cosmetics. Valve is just farming ez money from this shit cosmetic items.
2- I totally agree with what did you say about tutorial system. It's complete shit.
3- TF2 never tends to be a serious game with serious graphics and literally, I don't get why people criticize the game's graphics, It has a simple design and it fits the art style of TF2. There are even comic books of this game made by Valve. But every person's opinion is different and you're completely free to say "TF2 has awful graphics".
4- Performance? If you meant "optimization" of this game, hell no TF2's performance is good. If your PC is really bad, search up and download "tf2 chris config" or "m0re config". And you won't get VAC banned, Valve is allowing to change the game files, downloading mods, etc. unless you download cheat of course. all of the professional TF2 players are using graphic configs to make the game simpler. They give you a pretty nice FPS boost too.
5- I agree what did you say about matchmaking. Matchmaking is terrible in TF2. Matchmaking system added back in 2016 with "Meet Your Match" update, the update that fucked up and killed TF2. it's the reason why TF2 lose so many players. I don't understand Valve. Before this update, TF2 had "quick match" feature which finds a match about 5 seconds. This update was broken, it was finding a casual match between 5-15 minutes (now they fixed this.) and it was totally unnecessary and buggy. There is a lot to say about this shitty matchmaking system, this Gmod animation explains the shitty matchmaking of TF2.
6- Classes are balanced if you play with your team correctly. It's the reason why this game named "Team Fortress". You can't do 1v12 clutches in TF2 like CS. Sure, you can do that if you play Spy, but you have to be very skilled at Spy, knowing every trickstab location in the maps and you have to do that perfectly and your opponent must be some noobs who don't have an idea how to counter a Spy who knows all of the trickstabs.
7- I kinda agree what did you say about maps, classic maps are good in my opinion, if your team is bad, you can't do anything. But yeah some of the maps are completely awful, shit and they've should be removed in the first place nd we would have better queue times and the quality of the maps would of course rise. I totally agree with that. 2fort is the cancer of TF2, camper snipers, rocket jumper soldiers, soldiers with the pocket medic, heavies with pocket medics, engineers that always camp at the flag, etc. Even sometimes, getting out of the spawn can be a pain in the ass at most of the maps since soldiers and demomans are spamming rockets, pipes, sticky bombs to the spawn is always a common thing. You need at least 1 medic to get out of the spawn and kill the spammers.
8- I think weapons are balanced. Some weapons are just fun, non-tryhard weapons. Some weapons are useful for certain areas, some weapons are useful for some moments and circumstances. But in the past, TF2 had OP weapons ( for example: old dead ringer of spy was pretty much OP as fuck, 2011 Tomislav of Heavy was better than Heavy's default Minigun, which was ridiculous, etc.) but Valve nerfed them. Stock (default) weapons are the best.
9- There were/are many major game-breaking bugs in TF2 but I don't think it's completely a buggy game. Sure, there is always a game-breaking bug comes out in every month but it's a basically abandoned game so no surprises.
10- Community is meh. Some matches are fun some matches are very toxic.
11- And lastly, the bots and cheaters. These motherfuckers destroyed the game and fucking Valve doesn't do anything about them. This is the main reason why the game is shit right now, a lot of cheaters and bots. Cheaters weren't that much in TF2 before 2016 but bots are always at this game since 2009 the update that added hats (cosmetic) update. Bots were idling at idle servers and gaining shit tons of hats and weapons.
Also, TF2's biggest problem was/is hitboxes. It's bad and it was the main reason why Spy is OP. youtube.com/watch?v=YbpwynoLbFk