A receiver won't make any difference unless you get 5 speakers and a sub to go with it. You can go with a package deal (home theater in a box) or for better quality sound go with separates (receiver and speakers bought from different companies)
The best sound bars simulate 5 channel surround from a real 5.1 input, some just simulate the 5.1 surround from a single stereo input. The least expensive ones are simply 2 channel stereo with a sub. None of them, even the best models will ever sound like a real 5.1 or 7.1 surround sound system though. Sound bars are very handy for small spaces or apartments where you may not have be able to hide wires or you are unable to able to turn the sound up very loud. It really depends on your situation.
I read that in order to truly get the full audio experience of a Blue Ray player, you need a home theatre receiver.
I currently have a soundbar with compatible subwoofer that I hook up directly to the TV. I am planning on buying a Blue Ray player soon.
Does anyone know if I should buy a receiver given my current set up? In other words, will hooking my soundbar and blue ray player to a receiver enhance sound quality or is it not worth getting the receiver? I currently do not need to hook up my sound bar to a receiver.