I bought tickets for the smaller screen theater... and the only tickets left were in the back. Are they still decent seats?

Yes

Those are actually my favorite seats in that theater

They are good to see the movie, just don't stand up, your head shadow will be on the screen😂

If you're talking about the 4 row theatre.. you'll be just fine.. maybe the better choice for some people

We do not mind sitting anywhere in the small theater. The front is a bit hard because you are so close..but I think the back would be just fine. You still aren't that far away.