Problem here is people need to remember these are rookies who are learning what they're doing in the scheme while matching up with a higher level of competition. And then they're not just playing one position but multiple, which makes it harder.
From that perspective starting with Edwards he had a good game. He was thrown in there at LT first series and acquitted himself quite well, didn't win every snap but he won a lot of them and more importantly looked solid executing scheme (wasn't confused or lost at all).
Evans looked better on the run execution. He has decent feet, but needs a lot of work vs speed rushers on the edge with that kick slide. Of the two he's the guy who will require more time to settle in, and that's fine it's not like he's a top 10 pick who is expected to start.
Honestly I think some people shouldn't watch preseason games. It requires you to keep in mind what the coaches are after and accept it. Rams use it to help them make good decisions on their lower roster and I think that is the right approach.