Some think people don't like to scroll a lot, and others think people don't like to click a lot. That's more about usability than search engines.
Personally, I don't mind clicking when an article is broken up into reasonably sized portions, like many news stories are that I've read lately. BUT there's nothing more annoying than a lot of those "technical" sites that break down each article or tutorial into mini-bite-sized portions so you have to keep clicking away with every few sentences.
That is OBVIOUSLY done for page impressions for CPM advertising revenue, and some have gone so far as to not only not provide a printable version, but the pages are styled such that you can't even print the pages as is with all the ad clutter on them. And with some (black backgrounds, barely readable mind you) you can't even save the source to remove the clutter to print it out because they've got preformatted text styling for their ads that deliberately makes it near impossible. Too short is greedy enough, but it's zero useful and usable.
I've read some research stuff from very reliable sources that concluded that break-off points for reader retention are at around 300 words per page and then again, to small degree, at 2K words. And those were studies done by people whose specialty is converting visitors to sales.
Going by what I've read, 300-500 words is OK (maximum IMHO), and more than 300 should be broken at a logical place for continuity if its longer than 450-500.
If any search engine can't figure out what a page is about in 300 words, there's either something wrong with the writer or with the search engine.