So I'm answering this 10 hours later, which is an eternity on the Internet, but hopefully you still see this
I just finished the game with a fresh, shiny PS4 plat. No trophy glitches, which is always nice for a new game. The load times are way faster compared to the 360 version, and I'm imagining compared to the other console versions as well. Besides better load times, though, there aren't any other improvements I could see.
It's a Lego game, which I find are pretty mindless but completely enjoyable. As others have said, you pretty much know what you're getting. I did enjoy that I could cheat on half the races old-school GTA style by sticking a bus in the other guy's path at the start. Mwuhaha. And the story stuff was pretty good. Tons of collectibles, almost too many. Deadpool's stuff is great, don't miss it.
I did get random game crashes at times - all while flying with Iron Man. I think I had four crashes in 30 hours. Lego games always seem to have freezing problems though - on the PS4 the game just exits instead of freezing, which is nice, but it sucked when I was milliseconds away from the last checkpoint in the hardest race and the game crashed.