yyahoo: Underwhelming beginning to be honest.
I do like how they list that XCOM Enemy Unknown is 83% off of $49.98 on the front page, but when you view the game page it is 67% off of $29.99. IIRC $29.99 has been the regular price on Steam for quite a while now. They appear to be artificially inflating the regaulr price on the front page to make it look like a better deal...
The front page is misleading, it makes you think it's 83% off XCOM: Enemy Unknown, but in fact it's 83% off the XCOM: Enemy Unknown + The Bureau: XCOM Declassified bundle. (Which is listed at $49.98.)
It's hard to tell as well, because the X-Com games appear to be 67% off for me, but when I click on the package info for XCOM & The Bureau, it actually lists XCOM as being 75% off.
So this may just be a case of the buggy nature of Steam discounts when they start a sale. I'd give it a chance to settle before worrying too much about it.