For the purposes of this discussion, I'm ignoring the major changes/additions included in the 97 SEs and the 2004 versions; this includes the new errors introduced as well (swapped surrounds, poorly done lightsabers, etc.). I'm looking at the films with occasional blinders in place and am pretending the changes never happened, trying to enjoy what hasn't been molested.
I watched ANH first. It was awesome to see the first film in such great shape. Thankfully, the content has held up well also. I really enjoyed the experience that is ANH--so much so that I watched it several times over the course of several days.
I watched ESB about a week later. AWESOME. I love ESB. ANH is great because it came first, but ESB has better writing, better acting, and better directing.
Earlier this week, I finally managed to squeeze in ROTJ. I was excited going in, but my excitement gave way to the same nausea I get when I watch Ep. I. Han is now comic relief, the cinematography is crap (flat and lifeless compared to the depth and richness of ESB), and for the first time it occurred to me that the Empire built several gaping holes in the new Death Star so Rebel ships could fly directly into the core and blow it up. And just as with Ep. I, the great fight at the end is satisfying, but it's the same kind of satisfaction you get from eating Chinese food. It's filling at the time, but leaves you wanting later on.
I'll continue to watch all three movies in order as I always have. I'm a completist by nature; I can't watch FOTR without following it up with TTT and ROTK either. But ROTJ will always feel like I'm watching it because I have to, not because I really want to.