Dimples within normal depth aren't a cause for concern. It's the deep pits that are concerning. Dimples are normal and the ball travels too quickly to be thrown off by a few (or even a few hundred) dimples, so you'll never notice them affecting play. There have been some pics of really deep pits that go beyond pitting, but I'm willing to bet that those are extreme edge cases.
All that said, something has changed. A game with the same design (Spider-Man) as another (SMVE) has definitely shown to show a big difference in the number and depth of dimples. SMVE definitely sports a lesser-quality playfield, but it's within the window of when things were going wrong in Stern's production. Maybe that's been cleaned up by now.
Seriously though, don't let dimples bother you much. Do keep an eye on big pits in the playfield. If that happens, something is wrong.
I really wonder if modern games have just been sped up too much. I turned my coil strength down on Ghostbusters LE and I'm still making my ramp shots easily (even backhanding the left ramp). If dimples do bother you a lot, slow down your game a bit. In the end, the dimpling is unavoidable, but you can slow down the process to some degree. But as long as the dimpling is within normal range, might as well let it happen until things even out.