You know, partially i'd agree on this. However the Criteria for showing her Face is that she must have been romanced in ME2 and died in the last Mission and the game is imported into ME3. Basicly, you can only see her face when you killed her off. Imagine the rage of the Fanboys.
Seriously, i dont see her appeal. Didnt romance her at all, ever, not even for "shits and giggles". To me, Tali is kinda like the little Sister, a bit nerdy, lil bit cute, but no "Romance-material". Same as Liara isnt really either, too bookworm-ish in ME1, havent seen much of her in ME2 yet as i dont have Shadow Broker DLC so far...bloody DLC Prices. Same btw for Garrus there, he is more of a Warbuddy, you know, someone you go hopping around the Galaxy with, smashing People's Skulls and generally shooting stuff and then go drinking afterwards, but not romance-material there either.
So here's the Thing. If she is revealed, Tali that is, then make it partial. Do not show her full Face. Show a few Pieces, a little of the Nose, the Eye, maybe the Corner of the Mouth and a bit of Cheek. That way People can get a sense of what she kinda looks like without it being decided for them. Basicly you can please those that want the reveal while keeping everyone happy because what is shown is vague.
Kinda like the Sex Scenes in ME1. Only a little here and there but nothing "straight on".