Well I wouldn't say sleazy, I mean in the end, there is no technical afterlife for the KH verse (Final World is more like a purgatory before death, and the underworld from Olympus seems to act as more of a second Traverse Town when you start to think about it) and if you don't count Eraqus' spirit being there for him in his last moments; No one was sad to see Xehanort go.
I remember getting into an argument on /v/ a couple weeks back about Xehanort's "redemption" and I vehemently denied it was one. Lots of people, myself included would have loved to see Xehanort get fucking destroyed like a typical final boss should but that wouldn't solve anything really. In Xehanort's case, he needed to be convinced at the end of his life that what he was doing was wrong and that he made the wrong choices to get where he was. Destroying him wouldn't have solved anything for a number of reasons including the fact he could just show up and get revenge somewhere down the line (Remember, Vexen and Demyx and Xigbar are still part Xehanort). Point im getting at, Talking the guy down and handing the weapon he killed for to stop the big bang from happening again was the better idea.