Good God! The bathtube scene sounds HORRIBLE. So glad I missed out on all that. I try to skip through a lot of her scenes TBH.
I agree about IMO what I see as her limited acting skills. Now I know this kind of stuff is subjective and others are of the opinion that she's a good actress, but aside from some of the comedic stuff she does, I really don't get it when someone tells me she's good at the dramatic stuff. Her dramatic emotional voice is very difficult for me to listen to -- it has a weird quavering tone and quality that is very distracting and her facial expressions don't work for me either. I also don't like when she gets into her hyped up high volume excitable nerd talk. All this is why I just try to skip her scenes.
Looking back on it I remember especially a scene early in S3 when Sara had died and Laurel had brought her to the Arrowcave and laid her out on the table and Felicity, Oliver and Roy (I think it was Roy) came in and saw Sara. It starts out as a very quiet still moment. Laurel is very quiet and subdued and so is Oliver and the camera is moving slowly, everything is very subdued and you can just feel the shock that Laurel and Oliver are in. I think it's a very powerful emotional moment. Then suddenly BAM! Felicity clomps over (literally you can hear her shoes) and marches straight to the center of the table upon which Sara's corpse is lying, and Felicity literally becomes the focus of the scene (even though she barely knew Sara compared to Laurel and Oliver). Then Felicity precedes to make herself the center of attention and she literally yelps -- staccato bursts of yelping in a loud voice --- over Sara's death. Completely takes all the attention away from Laurel and Oliver's reactions and just ruins the mood. So when I look back on that I also think that was foreshadowing about how Felicity was going to take over the show and pretty much become the central focus of everything that we now seem to be stuck with
I think the solution (short of getting her off the show which won't ever happen I'm sure unless the actress wants to leave) is to try to minimize her role again. She should never have been given the prominence she currently has. But as long as they plan to go down the Olicity path, which I think they will go right back down, I'm pessimistic that they will ever cut down on her screentime.