What I appreciate in good design is not only looking good but standing out from the crowd. The problem with imitating others is that you end up looking like everything else. It's not offensive. But also not remarkable or memorable. A lot of web design suffers from being bland and generic.
A few years ago we had an app and our designer came up with an intense shade of red that was slightly pinkish. He then proceeded to use that for our app icon. Net result: it jumped out from all the other icons on the phones apps drawer. The whole app looked fantastic but that icon was awesome. You could not not notice it. Everybody else was using fashionable blues and greens that literally everybody uses.