amyseng
Lovinthehd already put in a good answer but I can't pass this up since back before I joined the AH I also thought about such issues. If my TV has all those HDMI connections, why not use them?
lovinthehd hit the most important one: the AVR's codecs and ability to decode and pass high quality signals surpasses the abilities of a TV. Hands down there's more advanced function and better quality to be found using your AVR rather than your TV.
For me however, I discovered the real benefit through the WAF factor (wife acceptance factor).
If I hook all the crap up to the TV, then my wife had to choose which input for which thing to watch and it was a never ending confabulated mess just for her to watch TV. Negative husband points.
If I hook all the inputs up to the AVR and run a single HDMI cable to a single input on the TV, voila, watching TV just became easy again. WAF factor up 100%. Positive husband points. Combine in a Harmony remote to keep everything graphic and icon based, and my wife can operate the whole shootin' match with the press of a button and it works nearly every time.
Sometimes its the little things