This is more of an observation than a criticism, but there's definitely been a swing on this sale towards offering a base game at a much reduced price, but trying to lure you in with a load of bundled dlc which has a much smaller discount. The bundles are getting the headlines on the Steam main page as well, so you have to go looking for the unbundled original. I assume they think this will be more profitable for themselves and the publishers, which seems like a reasonable goal. The specific hook which is a tiny bit underhand is the fact that if you just buy the base game, you can't later top it up to include the dlc, even at a slight price premium - you'll get completely stiffed on price if you try to add the dlc later.
In the end I was reeled in with Don't Starve and the expansion pack. I found I don't really enjoy the game so wish I'd just bought the base game, but was psychologically manipulated into buying both. No big deal though, I could have loved the game and got more than my money's worth.