Olaf is pretty versatile in the sense that, in many cases, he can build tank or damage and still do his job (getting to and killing the enemy carries or keeping them out of the fight long enough that your team can beat their team) effectively.

Tanklaf = 9-21-0
Olafgar = 21-9-0

Tanklaf

In match-ups were you are automatically going to get poked to heck and back you can go 9-21-0 and just build tanky to survive the poke while getting the farm that you can. Ragnarok still lets you get to the enemy team's carries unimpeded by pesky crowd control. Reckless Swing still...
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