Just adding my two cents to all of this:
NFL
I don't think the Bucs' jerseys are that bad. The font is strange, but not awful.
The Steelers need a rebrand. It's classic, sure, but the logo has nothing to do with steel or Pittsburgh. (Edit: no it doesn't I need to do my research!)
The Raiders' logo needs updating. The shading on it doesn't look great.
NBA
The Bulls need a brighter shade of red. Plus, the font on their logo needs an update.
The Pistons' identity is the worst in the NBA. It has nothing to do with Detroit or pistons. Go back to the horse.
The Warriors' logo is bad. It's just a bridge, and that bridge is not iconic at all. They should go back to the star on the bay with California in the background.
The Lakers need an update. All they need to do is remove the "speed marks" on the Lakers part, and update the colors.
The Clippers' identity isn't awful, and was definitely an improvement over what they had before. However, they should still go back to blue and orange.
The Hornets have the best color scheme in all of sports.
MLB
The Orioles need to go back to the cartoon bird. It looks much better.
The Anaheim Angels logo is great and they should go back to that.
The Yankees logo is bad. Just switch to the NY logo.
Note to Cleveland, Detroit, Colorado, Pittsburgh, and San Diego: just letters without any sort of design looks bad as a primary.
The Marlins color scheme and logo is great and is one of the best in the MLB.
NHL
The Hurricanes logo is great, and their identity isn't bad, but it doesn't hold a candle to the Whalers.
Fauxback logos are dumb. New York (both of them), Pittsburgh, Buffalo, and Toronto's logos all look awful. (Especially Pittsburgh.)
The Minnesota Wild have the best logo in all of sports. Period.
The Golden Knights name and logo are great, but they just need to get rid of the white on the logo.
MLS
DC United and Columbus need to update. Their logos look outdated.
The New England Revolution's logo is amazing. Absolutely beautiful.
Anyway, those are my opinions. Not sure how many of them are actually unpopular (387 pages are a lot to go through), but here they are for arguing with about how x logo is clearly better than y logo. Enjoy!