HD is crap. It's no better than SD on most tvs anyway.
Even on "HD Ready" sets there is a marked improvement when fed with an HD signal (providing the HD interface is actually being used).
Those that can't see it have either got worse eyesight than they thought, or that cheap television really was a cheap piece of chinese shit.
Yup 
That said, there are some not-so-great HD sources.
Absolutely TB, it all comes down to you get what you pay for.
Most of my friends thought that the shrinks were right when I laid out £2000 on a pair of subs for the living room, (unsurprisingly) those same friends soon changed their opinions when they heard the subs playing in real life.
Am I the only one who looks at a load of TVs and compares them?
I have about a grands worth of Castle speakers - 4 bought in sales
I can't be arsed with TV full stop, although the missus & kids have ensured that it is there for them.
My weakness (apart from supporting the local landlord) is music.
I watch two or three things a day. But I do like good documentries and also the better dramas such as Spooks, Hustle, LOM/ATA, Survivors, Doc Who, also I reckon 3/4 of what I watch is BBC, I don't do soaps, reality, most sport except motorsports, Olympics and Rugby internationals with England.
US sit coms leave me cold. Few decent UK ones apart from IT Crowd and Benidorm