The same reason why i 2nd her in melee.I call it "Free damage".
UP+B
In brawl and melee people would try and attack you and what would u do? Shield grab right? Well what if its a marth that attacks u witht the tip of his sword......you cant grab him cause hes out of range, right? Well samus has ways around that. The moment the foe attacks your shield.......press UP+B and it wil suck them in for about 10-14% damage. It works on ALL characters.
Zair
Another thing that is "free damage" is the Z-air. Zair= press Z while in the AIR with samus and she will shoot her grapple. It only does 4% damage but its 3.5 times longer than marths sword. this can be used to keep foes away from you if they are characters like metaknight,pit,sheik,falcon....ect. You can also leap off the stage and hit peopl with it to make then lose thier 2nd jump.....i personly love that aspect of Zair. But perhaps the best thing about Zair is that it has ZERO lag once u use it and touch the ground immediatly after. You can do things like this http://www.youtube.com/watch?v=cr44ZWwR348
Projectiles
Obviously people would assume this is samus's MOST IMPORTANT aspect. In brawl if you use an attack more than 3 times in a row, it starts to do less damage. Well samus's projectiles DO NOT suffer from this if you throw in a random move every once in a while. A homing missle will always do 5% damage. Super missle will always do 10%. Fully charged blast will always do 25%. Also, as with all projectiles, projectiles add pressure on the opponent. It forces them to come to you, which always puts u at the advantage because they are now in the range for Zair.
ALl of that is why i main samus in brawl. the only problem i have with her is that she has low priority and she is low tier.
