As a pc player that enjoys playing games with high framerates I completely expect to be fucked. The showcase that we saw did not look like it performed well. Whoever was playing those sections did that slow walking and movement of the camera that devs do nowadays to hide the poor performance. Its becoming increasingly more obvious every year when we see new releases.
I love Bethesda games though, and will buy day 1, but I completely expect it to have a bad release. No matter how great the game is, that's absolutely no excuse. Its hard to even just pin this on Bethesda anymore, its just how the industry works. The problem is that Bethesda would get away with it before as they had garnered some good will with their fanbase. Its different now, Fallout 4 had major issues, Fallout 76 happened. Starfield I think will be the line in the sand for a lot of people. It either has to release with minimal issues and serve as a decent 'one of those' or its design has to be so ground breaking that it shakes things up in the 'rpg' open world genre whilst releasing janky as hell. I definitely think they're more likely to do the latter, but thats only when comparing to the former. In the real world I don't think they're going to achieve either. Luckily they have Elder Scrolls coming next. Something tells me we're going to get it a lot sooner than intended after the release of Starfield. A lot sooner meaning in the next 5/6 years instead of how Todd previously spoke about it which was like 'we don't have the technology to achieve what we want to achieve yet'.
...but yes, expectations are too high, but not without a tremendous amount of niggling doubt