No he doesn't have to have the perfect abs. On the other hand I think it isn't not overrated. I love love love abs. That's the first thing I want to see when a guy is shirtless. I'd rather fully visible. But again the whole package is important:)
A six pack is part of your abs so I don't really know what you mean but having this as separate things. I think they I p, I had a six oack before I got injured in sport and I loved them cause it makes you whole body stronger and girls may like them. Only thing was they are no the ones you see in magazines, they take forever to work on.