I can't parse this-- yes, a TV failing after 5 years is bad. Did you mean.. the equally low end TVs were a lot better than the black friday no-name deals? (which, from what I've seen is not true.. often black friday deals ARE brand names).
Or are you saying the replacement after 5 years, a low end, was much better than the previous one it replaced? But you said they were both better, not the newer one was better.
I bought two lowend 32 inch TVs five years ago. If I remember correctly, they were about $350. I replaced them with TCL Roku 32 inch TVs for $169 (regular price). The Roku TVs were much better - smaller bezel, better pictures, and the Roku smart TV platform is the best you're going to find as far as features, interface, etc.