I have seen about 200, maybe some more. Most of them I've seen or reseen in the last 2 years, and I
would like to say that I've seen in these 2 years nearly every Spaghetti which could be labelled as interesting.
In the 20 years before I had seen about 30, the widely known ones (Leone, all of Corbucci, Sollima, Colizzi, Clucher, Damiani, Hossein, Questi, even Valerii).
Then I thought that there were only about a dozen which were interesting, which were better than average, and that 95% were awfully bad.
Now I think that there are about 50, maybe 70 which are worth watching a 2nd time (or more).