Part # are another area where Google Search has notably gotten worse over the past half decade. I've emailed multiple Googlers who claim to want to fix these crap results, but I have yet to have one bother to respond (despite them replying to my comments asking me to contact them!)
Where Google kills it is built-in currency conversion, wikipedia previews and such.
So, all those things that DDG has as well? ;)
And I tried Qwant, but didn't like it and after a short return to Google (which was very short because I've become too used to bangs) I swallowed my annoyance and went back to DDG.
I think what's happened is that the biggest sites figured out what it takes to rank on Page 1, be it keyword-stuffing blog posts or whatever. The "interesting" sites I liked didn't update as much, so they fell down the rankings.
It's extremely apparent when a site is SEO-optimized, and for me that turns me off, especially if the area is a niche topic and not well served. If it's something like a reliable way to unclog a toilet, I'm not picky, the most popular search result is probably the one I'm looking for!