Sets: There are very few sets that actually do anything, and they don't help too much.
I only just learned about sets, how many are there?
Diverse weapons: How is this bad? Diverse weapons are good, it means there are many different playstyles.
There shouldn't be so many variants of the same weapon. I just don't think there should be a ton of weapons with different advantages and disadvantages.
Bullets that push you back: On the ground, there are only a small handful of bullet weapons that push you far. In the air, it makes sense.
Heavy's minigun, scout's shotgun, sentry gun bullets, just to name a few. The only thing that should be able to push you back is the air blast, and any explosive.
Melee weapons that reach far: Ok.
Demoknights: Demoknights aren't hard to stop. Try shooting them.
They come at you super quick and you once you're hit, you're done for. It's bullstuff.
Backstabs while moving rapidly: Explain.
A backstab while the enemy is moving too fast, or you're moving too fast.
Spies that don't make footstep noises: How would that be even remotely fair? The point of Spy is to be stealthy, and you can't be stealthy when every step you take gives you away.
They're invisible, not floating in the air. I would like some sort of way where you can walk slowly. Crouch achieves that, but you still have footstep noises.
Noisy Spy cloak/uncloak: Don't cloak/uncloak next to people.
If footsteps are silent then I expect cloaking to be silent. It's all about consistency.
Limited F2P backpack space: Buy something.
Inability for F2P to trade: Buy something.
Inability to add friends as F2P: Buy something.
First, VALVe can increase F2P space inexpensively.
They store so many things such as stats which are way more expensive as far as data goes. They also have no reason to stop F2P trading, because that won't even hurt them. If TF2 is free then why the hell do I need to buy something to add friends on Steam?
They're just trying to grab your money.
Broken points system: Explain.
For example, sometimes a heavy gets 25 points for killing me. Sometimes I get so few points for great kills. I've seen someone get 25 points for an assist. I've seen enemies get so many points for just finishing me off.
Another thing is going through enemies. I'm usually for a balance between what you can do to enemies and what can you do to team mates, however it's a bit hard to do something about it.