Edit because I can't reply any more: As dsfyu404ed says below, it tends to drop the central term of the query, making the results 100% useless. Not that they're particularly useful even if it doesn't do that...
It's particularly infuriating when it drops the location word from a search query for info on law and regulation.
I don't care if broad form automotive insurance is available in some non-specific state, I care about if it's available in the state that I put in the query.
Edit: Why is this downvoted?
It's lunch hour at Google, and people there are hitting their phones and HN.
You can see a lot of interesting trends on HN by day and time of day. Watch what happens to any story critical of insert nation here after 6am in that nation.
Or notice how on Fridays (NA time), HN is pretty much a ghost town.
But then again, it doesn't seem like a simple problem and one that has companies in either way.
As long as I can force it with quotes, I'm happy. Google has even started suggesting next to the results "include only results with the word XXX", to remind me the quotes might be needed.
I should investigate how to write a search plugin for Firefox that " puts" "every" "word" "in" "quotes"
Or maybe I've just grown numb to their presence.