F1 is a victim of Bernie Ecelstone's unyielding penchant for fixing what isn't broken.
Some of the changes made during his reign have been for the better, most have not.
Slowing the cars down, had to be done. As cool as it was to see F1 cars reaching ludicrous speeds down the straights, I sincerely believe that they were just too fast to remain as safe as they've been since the loss of Senna.
Technically, "hybrid" has been an element of F1 cars for many years. KERS was the first foray into hybrid supplemental power. They now have a second onboard energy capture/discharge component.
DRS is a great feature, but its implementation sucks. If they allow cars within 5 seconds (or more) to engage DRS, it would be fantastic. As it is currently, by the time DRS is enabled, Vettel or Hamilton has dashed out to a 3 or 4 second lead and the race is pretty much decided.
Tire wear is also ALL on Bernie. People want to pile on Pirrelli, but they are just building what he tells them to.
"Pay Drivers" should not be allowed. Yes, F1 is crazy expensive, if you can't afford to field cars without putting an asshat like Pastor Maldonado in one of them because he brings sponsorship money, pick another series.
In season testing and modification should be at least minimally allowed. Not allowing it is insanity. If your car is shit in Australia, it's going to be shit all year. Game over.
Conversely, teams lucky enough to start the season with a fast car are all but assured regular podiums.
I would love to see a team like McLaren that's been floundering all season, come back from a 2 or 3 week break in the calendar and shock the shit out of everyone when the time off allowed them to sort the car.
Bernie needs to retire.