Definitely don't generalize vintages. 2000 was a bad vintage in Valtellina and good in Piedmont, for instance. Valtellina has its own weird micro climate. 2002 sucked in most places but was pretty good in Collio (Friuli). As far as I know for sure 1999 and 2001 were great in Valtellina, but since its Nebbiolo it takes a while to confirm it (the '99 Grumello by my favorite producer Alberto Marsetti still tastes simple).
The thing I've noted about Valtellina wines is that they are one of the best food wines in the world. They are often hard or not forthcoming aromatically, light coloured, and light tasting ; but they accompany food perfectly. They meld with food. So hats off to the mountain climbers who pick the grapes and wait 7,8 years and you will be rewarded.
There's a blind tasting session that I have yet to post where a 1997 Inferno Riserva Rainoldi beat the pants off of 6-7 top flight Barolos from 97-98-99 vintages plus one '95 Brunello. Second place was won by a '97 Ghemme. The Barolos were still too tannic to judge after 7-8 years.
There's another time when an '88 Grumello (Valtellina) beat a '90 Francesco Rinaldi single vineyard Barolo.
Moral of the story is: I'm a big supporter of Valtellina. In part because of its underdog status, but also because of the surprises and pleasures it has given me.
I just hope these bigger producers, who get to export to the US, don't mess it up by adding additives, colorants,etc.
Triacca is a bigger producer but it sounds like they are still doing things right (light color, etc.). My recommendation is to cellar these wines, until 8 yrs old is generally good, and see what happens.