No doubt, many AV amplifiers have good 2.0 channels sound. Somehow, high cost AV amp is better than mid 2.0 integrated amp and mid cost AV amps are inferior to high end integrated / separate 2.0 amps. This is a general, natural analysis.
I would believe if one is to get an AV amp for video on large TV, then visit the showroom for video demo as well as bringing your own CD's for 2.0 playback to check that the pure audio is satisfactory. Then you may trade the integrated amp away.
I added equipments for Home Theatre since 2006 when large LCD TV became affordable and acquired HDMI and HD DVD players in 2008 for music concerts. Somehow, Pure Audio 2.0 is always my main music playing. As the convenience of Web bids, I find many vintage audio amp shining at me. I got them at unbelievable low costs. I keep AV and Pure Audio systems in my living room. (Somehow, I use headphone in bedroom only)
the record spot: I can see AV amp are multi-channel ( 9.2) integrated amp plus video processor ( 11 Audio + multi systems decoders, lip-syncho processors ... etc). All features (channels and decoders ) have their own circuitry and parts to add up the total cost.
Modern electronics use more and more integrated IC instead of discrete components. This is the difference between legendary amplifier and current productions. The beauty of legendary 2.0 amps arebest cherished by music lovers of difference groups. For orchestral music, they search for 3D soundstage( width , depth and height) , the timbre, the ambience. For vocal, they are chasing after silky high, fleshy mid-low and mouth sizes... To conclude, the liviliness and palpable in music reproduction from these amps. I find very, very few of these exist in AV amps. Also, when I use AV for watching music concerts, video always draw my attention and my audio demands is fainting away - audio equipment is less demanding inside AV playing system ( for me).
Moreover, a 7.2 channels amp cost 4.5 + times ( + video processing ) that of 2.0 channels. So the sound of 2.0 integrated amps should be 5 times the sound of 7.2 AV amp of same price --if cost of sound is ideally linearly to the cost of components/circuitry/ design mathematically! So "AV amp are inferior to Integrated amp" is based on both are of the same PRICE range.