SaTsuJiN
Wielder of Thunder Seal
well .. buying a fighting game for the story mode is a waste to begin with.. thats like buying tekken and saying you dont wanna waste 40 dollars if the arcade mode isnt long enough
fighters are mostly purchased for the 2player modes because learning the game mechanics are the main focus
as for Tenkaichi 2, the "dragon adventure" is quite lengthy, there are also RPG elements where you purchase items to equip in the "slots" to give the characters different properties (some items can only be recieved via Shenron, (and I think the namekian dragon)
To do a strong guard against rushes.. you hold O to guard, then while holding O, you press and hold Triangle.. and they will take a deeper blocking stance... the person who rushes you will be knocked backwards if they hit you, and you will both become momentarily disoriented
another way to defeat a rush is either another rush (which will involve a cutscene analog rotation battle), a well timed teleport, or one of those self-exploding type moves (the ones that create an outward burst of energy in a sphere-shape)