Soundbars can be great for what they are. They make sense aesthetically, and some of them sound pretty good -- I can definitely see where they'd come into play in a secondary system, but I would never personally use one in place of my main HT/music setup, passive or powered. I think the misconception consumers have is that these systems are a one-size-fits all solution, when really they're far from it. Most customers I demo low-end soundbars for are often surprised at how "not good" many of them sound, especially with music. You can still get much better results with a cheap receiver and a decent pair of bookshelves.
ht Panasonic 60" ZT60, Monitor Audio: Silver RX6, RX Centre, Radius 90HD; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D
2ch Sony KDL-32W650A, Sony BDP-S1000ES, Marantz PM8004, JVC T-X3 tuner, Monitor Audio Silver RX1, REL T3, Apple TV, Peachtree Audio DAC•iT, Sennheiser HD598
lr Panasonic 50" ST60, Sony BDP-S5100, Apple TV
pc Energy CB-5, Audioengine D1, FiiO A1