They are not OP, if anything they are underpowered compared to previous installments , notably battlefield 4. And I didn't have a problem with them then either. You have a major skill issue. A helicopter is a force multiplier as are tanks and should absolutely devastate enemy infantry.
You have air vehicles as well. Get good with them. Its fair play.
The players in the helis and jets have so much more hours and practice than you do.
Like I said major skill issue and everything you said should be ignored except the spawn camping. That can go thats unfair.