Humility. I like it
LOL
Seriously though...I am no where near where I would want to be. I know people who have been shooting images 25 or 30 years or more who feel the same way as you do in regards to 'needs improvement'.
I do think you are a pretty good photographer. You definitely have a lot of subject matter to go after though in the way of product shots.
(are you sure you're not a hoarder? LOL)
On a more serious note there are a number of people here (you included) who are extremely good at product photography.
I do it as a hobby too but so far I haven't gotten that into product shots just yet. That said between Stickman, you, James, Pyzik, and a whole bunch of people it has definitely piqued my interests.