samus is pretty good in teams. she has a couple good kill moves like bair, dair, charge shot, fsmash, etc, that can help her be really successful if she's matched with a faster character that can set up short throw combos with her
her fair and up b are super useful for saving teammates, and she's pretty good at edgeguarding. she has all the good components that a good teams character needs, but she still lacks a lot of the fast options in neutral that would help her become more aggressive when sometimes thats what you need.