To answer the original question: no. Mainly because I don't think it's anything to get bitchy about.
Lea Michele is indeed talented. I'm pretty sure it's how she ended up on Broadway (Drama Desk nominee) and starring in a wildly popular TV series (Golden Globe nomination). I mean, it's not like she Anna Nicole Smith'd her way into the roles unless she has some multi-millionaire octogenarian husband locked in a closet somewhere clutching a face mask and a canister of oxygen. She is a bit overexposed due to the success of Glee, which isn't really a horrible thing (for her, anyway). But she has yet to play Fanny and it's discussed more from fans than anyone else (except maybe twice on Glee) or around here in threads that are on the specific subject which you would have to click on to read.
And yet, I really haven't heard anyone compare her to Barbra except those who complained that Lea's performance on the Tonys was too close to Barbra's rendition of the song. I really don't think she's anything like Barbra in looks, personality or voice. I'd personally prefer to see Idina Menzel as Fanny Brice, but that's just me.
"What can you expect from a bunch of seitan worshippers?" - Reginald Tresilian