Do we not think it's ridiculous that we individually interpret this thread so pedantically? Do we not also think it's ridiculous to phrase a question in this way? Do we not?
One simple definition of a 'perfect' album would be: one that doesn't have any bad songs on it. I think that's the definition most people here are using.
A better definition might be, an album that coheres seamlessly and works as a whole, that achieves some sort of artistic breakthrough (probably the wrong word there, but you know what I mean), and doesn't have any bad songs on it. That's the definition you and I and a few others have been using, I think.
Regardless, 'perfect' is not an objective descriptive, and hence the broad range of responses from