Despite selling many LCD and plasma TVs between 2006 and 2010 when I worked in electrical retail I've only just (as in literally within the last couple of weeks) finally moved to flat screen myself, up until now I've still been using a Panasonic Quintrix Acuity CRT as the flatscreens I used to sell had a vastly inferior picture (on standard def anyway) to my CRT, and so a 'tube is better' mantra is one I've held onto for a long time.
I note with interest how highly praised Samsung and LG are in this thread, perhaps times have moved on - when I worked in electrical retail both brands were to be avoided like the plague due to issues with reliability and performance as compared to brands like Panasonic and Sony. Working for a company which had it's own service department, I can tell you first hand that we had 5 Sammys fail under warranty for every Pana, and LG was considered so bad we didn't even stock it and would only get them in to order if a customer specifically wanted one. I've also never quite forgiven Samsung for pioneering that stupid piano black finish which looks stunning for 2 minutes after you pull the plastic off but will then scratch as soon as you look at it which almost all consumer electronics now come in.
I've now moved over to a Panasonic LED backlit LCD - absolutely beautiful picture but one thing that I just can't get past is how appalling the built in speakers are. It's not just my model, it's endemic to all flatscreens. That was the case when I sold them, but these were early flatscreens where the casing depth was still 4-5" or so, now we are down to 1" or less thickness it's got even worse. Considering that the CRT I've just taken out could fill a room with it's built in speakers (sounded about as good as a reasonable midi hifi system), I'm not too impressed to have ended up with something that sounds like a poundland radio despite being quite highly specced.
I'm aware that I could invest in a better sound system, but why the hell should I need to - sound is part of the TV experience and I can't believe manufacturers have still not done serious R&D on delivering decent sound within the confines of a flatscreen's case.