Unfair poll
I voted Great Sound... but really, that's just the entry level. If you don't have great sound, I'm not going to touch you.... but If you want the sale, you have to offer more.
1) Small Space / Attractive Boxes (if you don't sell my wife on the astectics then it's not going to happen)
2) Reasonable technology - While I don't look for speakers to push fancy LEDs, neon glow tubes, or anything else.. I am interested in Wireless technology for my rear speakers that doesn't conflict with my other wireless systems (phones, computer, etc) and still conveys the full quality (or 98.5%) of the music I'm playing.
3) Reasonable price - sorry, I live in californa... most of my paycheck is going to keep a roof over my head and gas in my car. If you can't sell me a system at a budget price ~$1000 - $1500 for 5.1, I'm never going to bite.