It's all bound up in the usual schtick around the current USMNT - We have an amazing, talented roster (because we have a whole bunch of guys in Europe now), MLS and our coach suck, we expect to get through group (because it's a high, but not unrealistic bar to put on GGG), but won't stand a chance beyond that (because our crap coach holds back our talent).
In actual reality, we have a talented, albeit young, inexperienced, inconsistent, and relatively uproven squad and an unproven coach who has had results in "less meaningful" competitions but had some letdowns during qualifying. This tournament is going to be a really good test for us on all fronts. We should expect to be competitive to get through group, we have a reasonable chance of doing so, and if we do that, there's no reason to suspect we're out of our depth in the early knockout round. The occasion might also get to us and we fall flat.