I have been an active new SW collector and aficionado for less than 3 years and so far I have bought and have ongoing orders together totalling close to 100 SWs (DVD, Bluray or a few DVD-r).
They have been selected after a careful evaluation process (for example by reading many of this forum’s informative threads) resulting in that over 40 % of these SWs are now rated 7/10 or higher by me, i.e. very good.
On the other hand only less than 20 % of all these I rate as 5/10 or lower i.e mediocre or worse.
Thus I assume that I have been able to systematically avoid most of the many less entertaining films in this genre apparently consisting of much more than 500 SWs.