I think "solid" is a bit of a myth - and no style is the "correct" style.
In my opinion the best tournament player is one who can scope and understand the way the table is playing, and then adapt his game to suit the play at the table - ie rock at a table full of maniacs, or 3 bet lots on a weak table, etc. Also, you can"t win a long tourney by playing the same style throughout - getting the timing right for gear changes is crucial.
I guess if being able to recognise and respond to changing dynamics is termed "solid", then solidity is a good trait.