Bring back hand checking.
Yeah, and bring back the illegal defense rule too. Also, how the refs call moving screens needs to be tightened up.
It's too easy for guards to get free for open shots, either at the rim or behind the three-point line. There is very little in the way of diversity on offense, teams pretty much run the same play or two over and over again all game.
I found the style of play form the 80's and 90's much more enjoyable. Post play was emphasized far more, and getting open shots required more creative sets. Yes, this style of play did also make isolation offense of greater importance, but that's a minor trade off in my opinion. I liked the tough, physical nature of the basketball from the previous eras.
It's not that I find today's style of play boring, it's just not quite as enjoyable as it used to be. But I realize right now I am in the minority, the younger fans clearly prefer the way the game is played today, so I just accept it for what it is.