off of the diddy topic.
imo, in order to improve her metagame a samus main must play as many different chars as they can (given the player is skilled at the char) all the time. because different moves can be used well aganist different chars and vise versa. ex- continually using zair aganigs fast chars like mk, sonic and marth prob isnt the best option seeing as how the landing lag is just enough time for those chars to get in a hit and perhaps start a combo. or like how using excessive spam aganist chars with reflectors isnt the best option. on the other hand, using zair aganist chars like bowser, dk and gannon is teh sheeet. by doing this one must constantly change up their play style which builds a well rounded samus. i think this and not specifically at's will geatly imporve her metagame.
overall, experience is all we need. or in otherwords, time.