My vote is to keep the helmet on.
Tali's personality (and a bit of her hips) are what make her so endearing to fans. The basis of pursuing a relationship with her is the concept that Shepard loves her for who she is, not what she looks like (and her hips).
Removing the helmet would completely dash that air of mystery, no matter how well designed or well received it was. There is so much speculation, fan art, and even jokes about what quarians may look like, and I would hate to see that disappear.
If BioWare is dead set on some sort of reveal, they can take a middleground by possibly showing another quarian unmasked (or partially unmasked, like if the helmet broke), while leaving tali a secret. Even then though, the wonder of the Quarians would disappear.
Tali's personality (and a bit of her hips) are what make her so endearing to fans. The basis of pursuing a relationship with her is the concept that Shepard loves her for who she is, not what she looks like (and her hips).
Removing the helmet would completely dash that air of mystery, no matter how well designed or well received it was. There is so much speculation, fan art, and even jokes about what quarians may look like, and I would hate to see that disappear.
If BioWare is dead set on some sort of reveal, they can take a middleground by possibly showing another quarian unmasked (or partially unmasked, like if the helmet broke), while leaving tali a secret. Even then though, the wonder of the Quarians would disappear.