I must admit, I'm probably a bit out of touch with the quality of sound you get on modern TVs, on the basis that when I visit someone and we end up watching something on the telly, it's usually because it's the house of an enthusiast with an above-average TV and surround system.
The indestructible[1] Ferguson set that adorned the family living room when I was a teenager was crap though, and did the same sort of speech distortion that you expect from the ubiquitous 1970/80s 'educational' tape recorders with cheap veneer and those horrid 2-pin DIN plugs. And the 14" set of my own was notable for it's lack of either a) a line output or b) Ceefax, either of which would have greatly improved the experience.
The sort of rubbish that Mrs Barakta's-Mum and Dr Biggles have liberally distributed throughout their environment for ignoring the news and pacifying grandchildren is probably more typical (they're the sort of people who'd buy a TV because it was recommended by the oik in Currys, or on sale in Tescos). And last time one of those got switched on in my presence was because I'd hijacked it as a second display for wrangling race results...
Still, if the squeakers on my 32" 'gaming' monitor are anything to go by, they're pretty dire. I assumed they'd applied the same sort of technology that allows laptops and phones to make a respectable effort in the limited space available, but evidently not.
[1] FCVO. I repaired it at least twice. And I think a professional had at it a couple of times before my parents trusted me with such things.