"Soundbars good or bad for the audio world?" I'd say neither. They are a mutation of consumer attention span deficit disorder. To me, anything "modern" that relies on a HDMI ONLY source is doomed to be outdated ASAP. I have read many stories from soundbar purchasers of HDMI DRC restrictions causing certain movies or video sources to not output on the soundbar. It could be a HDMI revision issue which doesn't allow the source media to confirm DRC. Also, sometimes it is an ARC issue. Smartly, some people realize they could use RCA or 1/8 mini jack instead, but when they look at their equipment, one or the other is HDMI only.
So, in a way you get "stuck" being a slave to the whims of industry should they continue morphing DRC and/or HDMI standards (or something new altogether).
This just means that soundbars, in their current state, will be a blip. Few would be collectible as interconnect standards keep changing. And, as panels get even slimmer, maybe the next trend will be something discreet that is no longer mounted to the flat panel?
With that in mind, I bought a soundbar that is compatible with my older equipment (meaning it has option of analog in) Oddly, it seemed most soundbars I considered were HDMI only meaning they wouldn't work with my 2006 Toshiba flat panel and DVD player.
It works fairly well. However, the DSP is overwhelming! Soundbars use lots of DSP to make them "sound good" at varying levels in regards to what their modest internals can actually reproduce. My soundbar has 2 distinct DSP modes: "MUSIC" and "MOVIE". Watching a movie in MUSIC mode is good, and using MOVIE mode is even better, sounds quite good actually. The DSP is lost in the dynamics of the movie.
However, listening to music in MOVIE mode is unbearable! The DSP is way too obvious and sounds horrible with music. If I use MUSIC mode, it is better, but you can very clearly hear the DSP is on the verge of being hyperactive, if you listen at 75%, which is where DSP will begin to reduce the subwoofer volume (separate sub soundbar) you will constantly hear the DSP kill the sub anytime the low end passes a threshold. And I mean KILL the sub, like how traction control in a car can go overboard.
Anyway, it is a highly regarded soundbar system that sounds great on movies but can't really be relied upon for anything more than the most casual music use.