I have a friend who just built a PC a few months back and is buying up so many things this sale, he LOVES it. I think the first couple sales you experience are always best. After a few sales though, they seem less good than they used to be simply because you already have so much of what you want.
For instance, by day 5 of my first sale I had probably bought over 10 games. By day 5 now, only 2: Metal Gear Rising and now Blacklist. Both new-ish games. So many other good deals, like Witcher 2 for $4 or New Vegas Ultimate for under $7 seem "boring" to me simply because I already own them.
Basically, pretend your Steam library was empty, and THEN tell me the sales blow lol.