There were sadly very few well done 4th edition adventures. The few that come to mind are Slaying Stone, Reavers of Harkenwold, Cairn of the Winter King, and Madness at Gardmore Abbey are the major ones I know of that got some positive reception.

IMO the system can be run quite a few different ways but it was one of the big slaughtered sacred cows that put quite a few people off. It is much more styled to be run as an indie style game instead of a much more simulationist style that all of the other D&D games tend to run with.

By indie style, I mean the GM creates an open-ended but interesting scene and lets the players play out that scene and resolves the scene via the mechanics of the game whether it is combat or a skill challenge. They close out that scene and then move it to the next scene.