Regarding Personal Bias: Funny thing about bias is that we are often ignorant of it, so I won't rule it out. However, I'm a pretty straight forward guy without romantic ideas of things that go along with expectations. Maybe that's why you'll never see me describe wine in the usual froo froo terms, my favorite of which is from the move Somm, I think the quote was "a smell of a newly opened can of tennis balls" or something like that.
I've got Lodi Cab kits from six months old to 3 years old spaced just a couple months apart. I think I have a pretty good basis to judge my wines aging. I wasn't expecting major changes after 18 months and was pleasantly surprised to find them. Likewise, when a bottle isn't good on a particular night I'm fine with saying that too. There are many other factors at play besides bias that might influence how a wine feels or tastes on a given night. As we all know the meal you're eating it with will change the perceived taste of wine. One night the meal may be more salty or sweet than the last taste and thus changed the perceived body and taste when perhaps no change happened at all.
Last week we ate at an Italian restaurant and bought a $44 bottle of Chianti. We weren't impressed. After we flew back home I opened one of my 2 year old bottles of Sangiovese. It was on par, if not ever so slightly better than the restaurant wine. Of course the $44 bottle we had is probably $18 in most stores, but still I'm happy with the comparison. Last night I opened a 2 year old Eclipse Pinot that got one of the first outings in a Vadai barrel last year, it was very good.
Since I'm happy with my kit wines, and I've experimented with adding Chilean grapes to a Cab last spring (too early to tell if it helped), I won't worry about whether kits are better or worse than juice buckets or all grapes. Maybe someday after I retire I'll have enough time to take on more projects that start from grapes, but I'm very happy where I am now in my wine making.
My bottom line is that I enjoy the process of making my wine, I make wine that my wife and I find pleasing, I'm doing it with many varieties of wine, and I can do it at a cost that doesn't make me think twice about having wine every night. What's not to like about that?