I personally really like the med changes... It makes playing medic far less stressful.
I wouldn't mind it if the speed bonus wasn't as intense (or as fucking buggy holy shit) but I think in general it's a good change. Sue me, but it kind of reminds me of Overwatch - Mercy's wings make playing her feel so much better than playing Medic in TF2. That same concept doesn't work well for TF2, but the general idea of being more agile and able to keep up with heal targets is a good idea.
Basically it allows the medic to put his survivability in his own hands. Especially in lower level comp play, you're only going to survive when your team is keeping you alive by defending you and playing with you - the second they stop focusing on you you're food for the enemy roamer. This change means that I'm not as stressed constantly by teammates that might not be looking out for me anymore. At a higher level of play, it's going to mean that medics can be more aggressive in general, which I also don't think is a bad thing. Medic mains at a high level now have a higher skill ceiling. Who's complaining about that?
I think b4nny summed up the quickiebomb changes pretty well, basically saying "this would make a lot more sense if they removed its ability to destroy stickies".
Also this update objectively fixed framerates by reducing the amount of unholy stuttering that TF2 has had over all these years, which got worse and worse with every update. Especially when its main competition is a very well-optimized game like Overwatch, this is pretty damn important.