Way to discuss Samus without me people =.=
Yes, her main problems were her close range game, but, putting enough time into her helps you mitigate that problem as well. As stated, f-tilt is a great OoS punisher on frame 7, d-tilt on frame 6 (although I'm rather conservative in my d-tilt usage.) Her jab is easily interrupted, but jab cancel combos still come and go rather successfully (responding in 11 frames can be hard if you don't expect it.)
Opponents shield dashing their way through does become a problem, but again, this is mitigated through missile canceling-->throw/z-air to mix up the timings. Albeit, it doesn't fully negate the problem, and most times retreated f-air cancels or simply shield pressuring with d-airs are used instead. Or my favorite, slowly backing onto the ledge and using her impressive ledge game.
Regardless, the fact that many characters have to rely on ground approaches in this match-up already hinders them in many ways. Aerial approaches can be spaced and punished accordingly with only few exceptions to the rule (Marth and MK.) Otherwise, it's not too hard to space with z-air and OoS options from an aerial approach (throw, up+b, f-tilt, z-air are all acceptable responses.)
The only thing that held Samus back was KO power. If there were match-ups that'd I'd be afraid of (as in the MU is clearly not in my favor or just barely even, with me having to know extensive knowledge of the MU to win), it'd be along the lines of MK, Kirby, Wario, Sonic, Peach (although I'm not sure if Samus's new buffs would pull the MU in her favor now,) Marth, Falco, Wolf, Diddy and G&W.
What all these characters have in common are either safe aerial approaches or amazing ground games. All others, who while still may have one of these two advantages, often fall prey to trading hits and later, getting gimped (trading hits falls into Samus's favor in most match-ups. The occasional safe camping only furthers any percentage/stock advantage Samus may get) or simply getting outcamped.
I never found a problem facing Snakes in vBrawl. If I were to rate the MU, it would be 60-40 Snake's favor, but Snake really having to fight with all his advantages to win. Like literally, out of ten matches, Snake would only come out by maybe 2 or less, not more. Therefore, in bBrawl, I expect the match-up to be in Samus's favor... probably 60-40 with u-tilt being buffed (Samus is heavy to survive most of his other killing moves at high percentages) and her f-smash at medium percentages spelling out GIMP.