Ok. This is for the week 1 & no preseason crowd.
Chase Young had 1.5 sacks with no preseason.
Derrick Brown had a TFL and kocked a pass down.
CJ Henderson had a pick and three passes defensed.
You could even argue that Jeff Okudah didn't have as bad of a day because he didn't give up two TDs.
Simmons had an awful day for a top 10, non-QB pick. It probably couldn't have been worse. That is a fact. The lack of offseason and preseason is not a viable excuse because I have cited other dudes in the same situation who didn't crap the bed. I would argue that it isn't his fault because he isn't being used like he as in college. If he was being used like he was in college, it would be much more concerning.
Like Harry says, it is too early to define his career and guys develop at different rates, but that doesn't mean it isn't worth mentioning or isn't a little concerning.