The reaction Starfield got after the showcase was significant, that limited footage saturated games media for a few weeks. I think it'll review well and will be the most talked about game for a while at least, with lots of "you can even... ... In Starfield" articles popping up for a while. It'll be the most streamed game, everyone will have an opinion. If you are interested in games, you won't be able to miss that Starfield has released. Xbox will extensively market Starfield as an exclusive (I've already seen an ad on YouTube) and I don't see how the game won't drive Gamepass subscriptions and hardware sales. It'll be interesting to see how many people do subscribe to Gamepass as the game will take a long time to play through - if you're subscribing just for that game, it might be better value to buy it outright. Nonetheless, if it reviews well, I assume there'll be plenty of people who are curious but unsure if it's for them who'll grab a month of gamepass to try the game, including some who'll stream it. I think that Starfield will be an event, almost certainly the biggest game launch of the year in terms of media exposure.
I expect that Xbox will continue to market Starfield alongside Forza, when that launches, maybe with emphasis on it being on Gamepass with 3rd party titles that will come to the service this year.
I don't think Microsoft will hold back on trying to make Starfield a big event, and while I think some people will be keen to talk it down, ultimately I don't see why people who are fans of playing games wouldn't be at the very least curious to play it.