I've only had a couple burlesque classes myself, and they were more about the choreography than the technique, so maybe I haven't had the right input.
1. It can come across as badly performed and self indulgent (okay bellydance can do this too, but within this context it stands out more because you give it more attention, and have higher expectations - doing something different should require that its done well, otherwise why bother?).
I only liked that Elisheva because it sounds like something I would do, either that or trying to be sexy and maintain eye contact and accidentally put the straw up my nose.
I feel it is unfair to hold badly done burlesque to a higher standard, but I know what you mean. You are trying to emote to the audience, but putting badly done emote + awkward dancing then it starts going to another level. Sometimes I wonder if that is what I'm doing.
It's not that I hold it to a higher standard, exactly, it's just that I think the nature of it means the stakes are higher and you have further to fall. I've seen veil dancers hit by the Clinging Veil of Death (haven't we all?) and it's not nice when it happens, but it's much easier to watch than a burlesque dancer attempting to strip her legs sexily and accidentally boinging her stockings off her head....