If I'm being honest, after the initial shock value wears off, it seems a little less terrible every day, but it's still a little goofy looking. The old tab shape was getting pretty dated, so I don't think people would've minded a change, just not really this particular change.
Unfortunately, I also find the square tabs a little harsh looking. If you do decide it's too much work to bring them back, maybe you could hook us up with a simpler combination of the two existing options. As I see it, the detail which is making them a little goofy looking isn't the top border-radius, it's the bottom one. If we could get an option with the regular slightly rounded tops, but with 90 deg angle bottoms, I think they'd actually look pretty decent. Also with the little gap removed from the left of the first tab, like you do with the square tabs.
Example:
Unfortunately, I also find the square tabs a little harsh looking. If you do decide it's too much work to bring them back, maybe you could hook us up with a simpler combination of the two existing options. As I see it, the detail which is making them a little goofy looking isn't the top border-radius, it's the bottom one. If we could get an option with the regular slightly rounded tops, but with 90 deg angle bottoms, I think they'd actually look pretty decent. Also with the little gap removed from the left of the first tab, like you do with the square tabs.
Example: