I agree - the search results can be pretty terrible. One of the biggest problems is that it doesn't prioritise the matching of words in the title of a note. For example, I have a note with the title "TV". When I do a "Most relevant to least relevant" search, I expect that note to be right at the top seeing as it's the only one with "TV" in the title. Instead, I get a bunch of irrelevant notes with the word "TV" somewhere in the body.
I hear that the new CEO is going to fix a bunch of issues in Evernote. Please make this one of them. It's absolutely fundamental.