Literally every news site is left center according to them
Lemmy has a real, by U.S. standards, left tilt so the majority of the articles posted are going to use sources that fit that. Additionally anything posted from the few right wingers that Lemmy does have aren’t going to get much traction and you will likely never see them.
You’re asking if the site is “useless” but failing to ask the more important question of “Why is all of my information coming from places that have the same perspective?”
MBFC is discreetly showing how much of an echo chamber Lemmy can be.