If someones shielding, grab them or use a move that shield pokes. A lot of D-tilts shield poke as well as a lot of multihit aerials. Roll dodge spam however, is a very very bad habit that will get you eaten alive by anyone halfway decent at prediction. Running right into a shield with a dash attack is a good way to eat 30% damage. Keep in mind also, you do NOT always have to dash everywhere. Walking with a tilt or even crawling on characters that can works better then dashing and using a dash attack. Almost every character has a crap dash attack with a lot of lag attached. The few I can name offhand that don't are Kirby, Diddy, Peach, and Sheik. As a general rule of thumb, dash attacks against an opponent doing nothing is a very bad idea.
My Creations in Modnation Racers! Check zhem!
http://community.modnation.com/en-us/players/IvoYaridovich/creations
