As good as OSU? Probably not. But Jordan Addison, Brenden Rice, Tahj Washington, and Mario Williams aren’t exactly schleps.
Jordan Addison is in the NFL, he wasn't on USC this year.
Are any of those other guys top prospects? PFF says Brenden Rice is the best of them, they had him ranked as the 96th best player and 14th best WR on their draft board this year. They said he was the 88th best WR by play this year. They have Mario Williams as the 226th ranked prospect (there are 224 picks in the NFL draft) and the 450th best WR by play. I think Tahj Washington is below that as he isn't on the list - various other sites have him ranked 366th overall, "late day 3", a 7th round projection. No idea how credible, but doesn't seem like pretty much anyone thinks there was some particularly good crop of WR at USC this year (other than Fields fans).
If you're willing to compare that group to Chris Olave, Garrett Wilson etc. - guys who went 10-11 in the same draft - I don't know what to tell you. I think that's kind of silly and not all that honest. Fields had a much better corps of WR in college than Caleb Williams does.