It's not exactly a financially crippling purchase, so I generally don't mind getting a game I actually want to play for a relatively cheap price, accompanied by games I'm indifferent about for free. More often than not, the BTA price for the bundle was either slightly or significantly lower than the price on the Steam Store or wherever, so I consider the rest of the bundle a given.
I do generally check out the remainder of games, so for me, some of these bundles also encouraged more exploratory behavior in the past. I did come across a game or two that I ended up enjoying and completing this way, despite not ever having heard of it before.
Absolutely. Problem is, the quality of some of the amiibos, such as Sheik, are just godawful in general and no inspections are going to fix that.