I just re-read Deathworld on the Project Gutenberg site. It was OK. I liked the 'Rat' series much better.
I did too. He does his best work when it's comedy and not quite as serious.
Although it's interesting conjecture that "The Corps" and Commander Inskipp is in those books as well. So that makes you wonder if Harrison intended for this to be in the same "universe" as Stainless Steel Rat. Although Earth was long forgotten by then, whereas it's still known as the original homeworld of Humanity in the Deathworld series.
There's hints that Inskipp is immortal or supernatural in some of the books though, acting as some sort of cop or guiding force for humanity, so perhaps this is set several thousand years before SSR. Although more likely, Harrison just likes the idea of Inskipp and the Corps, so he re-used it.