I've seen worse specs, probably worn some at one point! Maybe the apparent grumpiness is due to work?

As for centring - why? All the photography bods say things about thirds and the like. Mind you, a little more work on getting verticals vertical and horizontals perpendicular to them might not come amiss. The more so should you ever be photographing sea-scapes. The number of shots I've seen where the slant on the sea horizon looks ideal for water-skiing . . .