I'm on chapter 4 of The Walking Dead, and only encountered 1 serious bug so far. It prevented me from seeing the summary of my choices in chapter 2. Other than that, it's ran great for me.
But I agree, that I avoid DLC-only games unless I'm extremely interested in it. I've maybe bought about 7-8 downloadable games on Wii and Xbox, but I even bought the disc version of the Fallout3 expansions so I've got them in a physical format.
If a console ever goes download only, locks out used games or requires online to play, I will flat-out not support that console.