Our last trip we did have ADR's and ate there for dinner one evening. The food was good...not great..........service was very slow.........waiter seemed to disappear for very long periods.....didn't see him around at all really which was kinda odd.

If you asked DH if he'd go back, the answer would be yes for sure. If you asked me, no I probably wouldn't. Again, I didn't hate it...just was hoping it would be a little better.
As far as would you feel out of place after being in a park all day...No, not at all......when we were there, we were actually in non park attire and there were far less people dressed like us then people in their shorts,tanks and flip flops........be comfortable and dress how you want to. You will see a little bit of everything there.
For a side note though, the Wolfgang Puck Express..... I'd go everyday to that LOL!!