I had a Polk Sound Bar for about a day. I think it was the model 3000. I know it was not the more expensive model they offer.
Sound was horrible and tinny even with the tone controls offered. I could not stand it. Connection options were also poor. If I can remember that terrible event correctly, it did not play all that loud either. At least not without sounding even worse. I returned it to Best Buy very quickly.

Like you, I was not expecting great things or surround sound realism. I was just hoping for something better than the very poor sound from my Sharp 46" LCD. My TV is connected to my 2-channel audio system so I have that option when I want but I don't always want to fire up my system just to hear the news and weather or watch one show.
The Polk soundbar was not the solution for me. I am sorry I wasted the time to research, buy, set up, and return it.
Good luck with whatever you choose.