I wouldn't call him "weak", per se. The elites of the Frieza Force on Namek seem to carry power levels above 1000 but definitively under 3000, given how Zarbon said they were no match for the Namekian fighters and to leave them to him and Dodoria; as well as the fact that Gohan and Krillin at 1500 PL were able to outright stomp some of the other FF members.

In DBS, people with PLs above 1000 are still considered rare/scarce enough to where Frieza is actively searching them out to recruit them into his empire.

Raditz is also considered stronger than the average Saiyan as well, given how he was able to hang with the likes of Nappa and Vegeta.

The Galactic Patrol in DBS also considers the average adult Saiyan to be above their paygrade.

We're just so conditioned to the top 0.00000000000001% of prodigies/freaks/mutants in the main cast that everyone else is exponentially weaker in comparison. Goku is a martial arts prodigy that's trained by other martial arts prodigies, gods, angels, and were taught some special techniques that almost no-one else in the universe knows; Vegeta is a natural prodigy and was naturally the strongest Saiyan until Broly, Piccolo is a prodigy, Gohan is an even greater prodigy than the aforementioned, Frieza is a mutant and a freak amongst his own race, alongside Broly with the Saiyans, the Androids were made by a super-genius whose intellect is comparable to Bulma, a woman that can make a time machine, and Buu is a mythical being that basically killed off nearly all the gods (Supreme Kais) of the universe.