I would always recommend paying attention to your room acoustics. Better speakers than what your TV has will make a difference, but beyond that you need to treat the room.

If you kill immediate high frequency reflections from walls, floor and ceiling to your listening position, and reduce energy of low frequency standing waves, you make a bigger difference than spending piles of cash on new equipment. And if you have a subwoofer, play around with the placement as even fairly small shifts can have a notable impact in your listening position.