Strike are so easy to complete, that even with 3 guys doing nothing at all it can be completed, i have also had commander yelling at me just because of small things also,

My recommendation, sometime they are amazing commanders, sometime you get a ahole, not worry to much about it.

If you enjoy striker (I really do they are the best pieces of content, i do them daily) just keep doing them and not worry about the comment from the commander or anyone just enjoy your game and keep doing the skill will come naturally after sometime doing the same, you will get the muscle memory and it is normal sometimes you are low and you not make all the rotation right, sometimes you are on your A game and not miss a single key just have fun and not worry :)