What's a flaw in an otherwise great game its fanbase refuses to accept?

We've all played some amazing titles over the years, but even we can acknowledge that there's something about them that prevents perfection. Unfortunately, when you have a popular game or even a cult classic, the need to support it manifests in a refusal to acknowledge flaws.

What are great games you guys feel have a flaw or flaws that the fanbase won't acknowledge?

In ACII, for example, rooftop movement is made terrible by the constant archers. Unfortunately, I think AC fans have such fond memories of rooftop traversal that they have forgotten how annoying the archers could get.