I guess that's fair, though really, Melo was more getting the criticism for not doing a lot of winning in the playoffs, no? Not necessarily just not winning titles. He won 2 playoff series in his entire time there. Harden has won 6 with Houston.
The Rockets also came the closest that anyone has come to beating the Durant Warriors, probably the best team ever. They made the conf finals twice, and basically missed out on a third time (last year) due to a tiebreaker with the Blazers. It's not the best record of winning ever, but the Harden Rockets have pretty clearly been more successful than Melo was with Denver (or the Knicks, for that matter)