Tbh, yeah it's kind of true. His moveset is a basic brawler, so it's easy to pick up on what moves do what. Mario has relatively safe shield pressure with jab, and if you pressure enough you can scoop 'em up with a d-tilt. D-tilt scoops MOST character at ~40-50%. Fair can be followed up from d-tilt. Also cancel your jab into your tilts. Usually jab-jab-utilt or jab-jab-dtilt can start combos, you could do jab-jab-ftilt if you need to make space from pressure. Fireballs are your friend if you need space and if you need to close distance since Mario can run behind his fireballs. If hit confirms, fireballs follow into dsmash or just about anything of you can predict or move fast enough. Learn to SHFFL. You can carry people across the stage with SHFFL'd nairs at certain percents (not sure what percents, but I've done it plenty of times. Also, make sure you sweetspot your nairs, unless you're making a wall to approach or space.) Grabs are good too, since you can dthrow to fair for kills. Just practice, practice, practice :3