If anything Rinder is suffering as a result of falling too much in the middle, not over the top enough to be a full blown comedy contestant, but not quite good enough to be a contender.
That said It's interesting that most people here seem think the 'comedy' element is being imposed upon him? I personally haven't really seen anything that suggests as such (though, in fairness I haven't seen anything opposing that idea either). I know the show regularly *weekly* lumbers contestants with terrible songs/theming etc, but I'm not getting any vibe from Rinder that he's unhappy with his lot.
I think he found his shtick week 1, saw the level of competition and decided to run with it (problems arose week 2 when Ed Balls realised he was utterly sh*t and was either going to be embarrassed by being first out, or stay the course longer and be embarrassed by OTT routines, went with the latter, and did it strangely better than Rinder).
Even his deadpan sarcasm, deer in headlights thing, i get the vibe is all part of his 'comedy persona', and that's coming from him- though equally i guess you could read it as derision towards theming at times.
That said, I don't even think his routines have been overly comedic for strictly;
-Courtroom based Cha Cha- very on the nose,
-A pretty straightforward prom themed, albeit saccharin, American Smooth (with added faces)
-Caveman Charleston- standard strictly
Saturday's dance, was the first full on comedy push theme for me (though, that said, not dissimilar theming to Pixie's gorgeous VW...) and ironically was probably, mistakes aside, technically his strongest dance! Though I don't know if that's a case for improvement, or a case of the 'story' of the dance hiding a multitude of sins better...
Either way i'm not sure he has that much time left, which is a real shame as he seems like a nice guy who may have had some potential to learn, but got swallowed in the murky place between trying to look good and be funny. Im not sure he was ever going to be brilliant, but thought he could go relatively far, unfortunately the initial week 1 buzz has died down, and seems to have shifted to Ed, which is a pity, because out of the two Rinder actually had some potential of at least emulating the difference dance styles! How fickle the British public is !