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, RX1; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D, Panamax M-5100PM
2ch Sony 32" W650A, Sonus faber Toy Monitor, REL T3, Marantz PM8004, Sony BDP-S1000ES, JVC T-X3 tuner, Apple TV, Peachtree Audio DAC•iT, Panamax MR4300
pc Monitor Audio Radius 90HD, Audioengine D1, FiiO A1
+ Sony 65" XBRX850B, Sony BDP-S5100