Preseason is, at the same time, both meaningless and wildly important.
It's meaningless in that without true offensive and defensive scheming on either side it's impossible to get an accurate feel for whether a team is going to have a successful season. The most famous examples are the 16-0 Patriots losing all four of their preseason games and the 0-16 Lions winning all four of theirs.
Wins, while always more fun to watch than losses, mean nothing in the preseason.
Additionally, even individual performances must be taken with some skepticism. We've all seen the hype trains of Bobby Sippio and Nate Eachus gain steam after solid preseason performances against backups of backups.