Do people, outside from online trolls and the anti-woke mob, think so? I haven't seen anyone here questioning her intelligence.
Personally I don't find her funny at all — I've seen a fair share of shows with her and only laughed once or twice at something that she has said. The thing about her having to smile all the time otherwise people think that she's dead from this episode was at least (somewhat positively) rememberable, but that's it.
The delivery issue doesn't help, I'm not going to lie, especially since all of her jokes take, understandably, a much larger amount of time to actually tell... which makes it so much worse when they don't land. If it's a one-off similarly unfunny remark from any other comic that literally takes a second it's easier to ignore it, but when you've just spent 10-15 seconds hyperfocusing (I'm not a native speaker, so I have to actually stop anything else that I'm doing in order to properly understand her) on what's being said, you tend to subconsciously judge it by completely different standards.
Perhaps she's a better writer than a stand up comedian, I don't know. It's hard to say when you don't know what exactly she wrote for the shows that she has worked for — for example the WILTY that I really love. I assume that the writers on there are the ones responsible for the hypothetical scenarios? But during live TV (from my experience) she usually does basic sex jokes that just aren't funny. Maybe you know something of hers that is and can recommend it?
Not sure why I've wrote such a lengthy response about basically nothing. Probably because I'm a bit torn on the Rosie Jones phenomena as I do believe that inclusivity is a great thing and genuinely admire her for creating a successful career in a sphere where her disabilities give her such drastic disadvantages... but I can't understand what is it that makes her funny. I wouldn't laugh at most of her jokes even if another comedian performed them or if I were to read them somewhere.
Although she's far from the worst contender that the Taskmaster has ever had (at least so far). The charisma-vacuum Mae were certainly more flow-disturbing from the recent seasons, at least Rosie seems to enjoy herself and doesn't collide with the show's overall attitude.