When my friend bought my Starter Traveller for my birthday all those eons ago I was really taken with the box cover art, the detailed map for Shadows and Mithril, and the occasional sketch in the rule book.
But wow, what an artistic desert the rest of the publications turned out to be.
Fast forward to 2002ish and Hunter and I are talking T20. I get a copy of T20 and wow, am I blown away by the full colored renderings inside. To me that's how the game should have always been.
I'm a bit more savvy as to what Traveller is all about, but still, if you're going to be a scifi game, then be a scifi game.
I actually did put down the game partially (not largely) out of a lack of art. And to be brutally honest, I never liked Keith's sketches. Especially when he paid homage to Syd Meade or Stewart Cowley.
Call me all kinds of names for those comments, but that's how I truly feel. You want scifi art? To me Angus McKee did some rocking stuff. Peter Elson and Chris Foss. Those kinds of guys are expensive, but if you want your game to take off and not hang around in the "it's kind of good" territory, then invest in the visuals.