Having spent many years as an actor I will say one other thing...it felt the main cast had no chemistry, they looked like they were delivering lines as if they were the only ones in the room and not telling a story. No cohesion, no relationships, just lines thrown out...cliched ones at that.
Please god leave the mirror universe alone. AND WHAT IS IT WITH ALIENS WITH EARTH DIALECTS. Irish?? Really??!
Yup. Its ridiculous. Lots of English accents as well. They want this franchise to be star wars. Its not.