which grandmaster played the most aggressive chess?

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DarkKnightAttack

Nezhmetdinov 

Strangemover

Nezhmetdinov was not actually ever awarded the GM title. 

NarrenSOfficial

Haha! Nejmedinov And Tal are better in strongstyle then 99.9999 % of our current players (Hikaru Maybe Excluded)

the_kickboxer

Mikhail Tal

AussieMatey

Don't forget Judit Polgar's nomination - probably because he was even more aggressive than her  -  Alexei Shirov. 

lukegk

tal, polgar, kasparov, and alekhine