I love this game. My POTO was similarly dirty and imperfect when I got it, so I tore most of it down and cleaned things as best as I could. Cleaned the playfield real well, but didn't do any touch ups etc (and mine has plenty of flaking gold paint and wear). Fixed flippers, switches, so that everything works right. So now I have a game that plays really well (fast!), and that's what matters most to me. There are plenty of times when I look at the playfield and think how nice it would be to have all the artwork perfect, but it's just not worth the time and money at this point. Fun game, great artwork, one-of-a-kind music, and a personal favorite theme.
Enjoy your game and don't stress out too much about the details.