For me it's all about the quality of a game's graphics. For example, I think Minecraft has very good graphics. They're clean, well executed, Notch knew what he wanted to accomplish and did. There are plenty of games that I think have quality graphics even if they aren't good looking by modern definitions.
Basically it's a matter of personal preference. I'll typically judge* a game first by enjoyment, but graphics can detract from my enjoyment of a game. It's all about whether or not I think it looks good, and I think both Deus Ex and Crysis "look good".