Please correct me if I'm wrong on this, but from what I can read in your post...

- Game A and Game B cost the same.

- You expect Game A to be rather average based on historic entries in the series
- You expect Game B to be amazing based on historic entries in the series

- Game A is decent, when you forget the brand name
- Game B is decent, when you forget the brand name

- You are cool spending money on Game A each time because it did not meet your expectations
- You are not cool spending money on Game B each time because it did not meet your expectations

So despite them costing the same and both being about as good as each other, you have a bitter feeling towards the one you had higher expectations for and lose faith in that series, while you had low expectations for the other series and it met the lower expectations and therefore you will continue being a customer for them.

I dunno man, it just seems weird to me to hold games to such different standards despite spending the same amount on them. I mean, I guess it's like food for me. I don't care where the food is from so long as it tastes great. It could be from a gourmet chef and still taste like a McDonalds burger and so long as they both charged me the same amount, I'd be okay with that.

This isn't a criticism by the way, it's just something I'm trying to wrap my head around a little better because I don't understand it. xD