I'm glad that our collective expectations are sky high, but a little perspective can make fandom less stressful. Every season is the same as far as when you want to be playing your best ball, and it's not until about 2/3 or 3/4 of the way through the season. You want to peak as you hit your playoff run. With 3 weeks down, there's a loooooooong way to go.
We have a bunch of new depth guys and our nickel corner has only been with the team for a few weeks. Last year we saw our defense get better and better later in the season; as everyone understood their assignments, the unit moved as one. That took time. Compensating for the loss of experience in Red, Clem, BB, Thurmond, and Lane will take time. We know the smarts, effort, desire, and ability are already there.
We're 2-1 against 3 playoff-level teams with 3 of the top QBs in the league. On 3rd down: 22/45 = 49%. Not great, certainly. But not reason to worry. I would be very surprised if we're still looking at a 1:2 conversion ratio by week 10.