meat,
Nice setup. Looks like a comfortable place to watch sports and movies. Room acoustics can contribute up to 50% of what you hear so it is a good idea to take a look at how your room is performing.
Room treatments can be pretty simple and inexpensive. By far the simplest and least expensive (and what might help in your case) is to look for the first reflection points in your room. Placing sound absorbing materials at those points could help signficantly by having the sound from the speakers reach the listener just once and not bouncing off a wall and reaching the listener just a little bit later. That can cause "muddy" sound.
To find the first reflection points sit in your listening postion(s) and have someone else move a mirror (12x12 mirror tile works well) along the walls until you can see your speakers. That is where you'd put sound absorbing material (approximately 12" to 18" on either side of the reflection point). For example it looks like there is a 1st reflection point above the couch along the wall from the right speaker to the couch facing the screen. Your floor is carpet so you need check the walls and the ceiling. I've not done much research on sloped ceilings, but I understand the can be tough.
Now, what you hang on the walls at the reflection points is the big question. If you Google Owens-Corning 703 (or Knauf) you will find compressed insulation panels that can be framed up and covered by acoustically transparent fabric that will absorb the reflecting frequencies. The WAF is really high at my house and so we are hiding those panels behind a quilt and we just bought a thicker rug to cover our tile floor. Acoustic panels on my ceiling did not sit well regardless of how nice I said they would look.
This
site is pretty good at discussing reflection points and other acoutic considerations in a HT. Enjoy!