The games story is actually pretty entertaining.
Also there shouldnt be anything really difficult, even the endboss is pretty easy.
Just play trough all of the games 12 chapters and get to know some of the characters you might wouldnt have played as otherwise.
If you should still struggle with some of the fights, there is always the option, to change the campaigns difficulty in the game options under:
"Options" - "Gameplay" - "Campaing Difficulty"
to a difficulty that suits you more !
Source: BAMMphil - trueachievements