How Does Google Interpret "spun" Articles?

Like the title says I'm wanting to know through your experience how does google interpret articles, or more specifically, heavily spun articles.

I'm asking this question because it pertains to my backlinking campaign.

I have been building links through teir 1 and tier 2 web 2.0's for the past couple of weeks. I've always spun my tier 2's to about 70% unique and hand wrote my tier 1's. The more I think about it the more I question if it's necessary to write "coherent" tier 1 articles. I mean if an article is 70% it seems to always pass copyscape. I CANNOT imagine google, even being one of the most financially capable corporations to have such computing resources available that can distinguish heavily spun "unique" content from it's source.

Does anybody else do it this way, what are the results that you have been getting?

Can I get away with just spinning the crap out of my web 2.0's and keeping the content excellent on my $$ site?

How could google possibly monitor this?

Thanks guys!

i tested this theory on a site of mine hosted on blogspot,

i had unique content on the site its self but using senuke i used the generate unique content feature where it grabs 4 articles and spins each article,

the sites currently ranking at the bottom of page 1 of google for numerous keywords after 2 blasts of the simple linkwheel, and the sites been up for about 3 weeks now,

so im not to sure if having spun content on your web 2.0's matters

Thanks Jake.

I mean think about it, if your sentence is about "Pancake syrup made from the finest vermont maple trees" and you spin an article that makes the sentence "syrup sugar from the best state oak trees" You still get those keyword associations that are not too far off. It doesn't really make sense to a human but the structure still has some meaning. Plus, I don't think google recognizes semantics in this way.

I would argue that >200% unique highly readable spun articles are more unique than comparing a set of say 1000 "hand written" articles on the same topic

This is def possible to get >200% and be very understandable (even grammatically correct in all cases when spun) if you have 1-2 hrs to do it and an ivy league grasp of the english language. If someone were to hand write 1000 articles, generally speaking, their vocabulary would be so poor that phrases/sentence level similarities would crop up constantly.
My guess is google has an algo to find directly stolen content or content with very high similarity (say 80-90% similar). Computing resources are too scarce and expensive if they attempted to do much more.
I'm sure google can tell if a bunch of web 2.0s are made with 10% uniqueness though. I also think that a "grammar bot" is probably the absolute least computationally heavy way that google can find spun content and I'm convinced google has one in place...