What makes ROB and G&W that good in this game?
And what is the general opinion on Falco's placement? (or better yet is there a tier list that people generally agree with?)
As Notorious said, there's only so many G&W players out there, and most of them are really good. So when going to a national, the experience fighting these characters is lacking compared to Melee top tiers, Ganon, Roy, etc. Players don't fully abuse SDI against G&W's UpB, Dtilt, and Uair- the main combo tools of GnW. His throws are difficult to react to given his throws are extremely close in animation. His down tilt is a frame 6 kill move around 115-130% on most of the cast, is disjointed with an angle that can be combo'd out of and a near horizontal angle great for ledge guards / gimping. All his aerials are strong and capable of killing, especially Fair & Nair. Dair has a landing hitbox making it somewhat safe on shield and able to lead into kill moves easily. And Bacon is a great tool in neutral. Not to mention all his aerials have long lasting hitboxes with almost 0 sourspots. Finally, his gatling combo and smashes in general are powerful: able to kill as early as 60% from Usmash and around 80% from Fsmash.
Rob: what Notorious said nails it on the head.
Falco is seen less than G&W due to the engine change from Melee to PM and the way he feels is off-putting. Most Falcos will stick to Melee. The other reason he's not seen in PM compared to the other portion of the cast is in part to the cast itself. About half the cast are floaties, making his MUs tough / boring (see: Falco v any floaty like Puff or Peach). Not to say those MUs are losing, but PM has generally larger stages: Delphino's, Smasvhille, Green Hill, Yoshi's Island (Brawl), etc.Since floaties got buffed compared to Melee and Falco only got nerfs, it's become much more difficult. Falco's recovery as said countless times elsewhere, is not anywhere near as good as Fox's. His UpB is very short ranged with high startup, and SideB is only good at certain heights while having very little drift.
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Edit: GabPR that has got to be my favorite post regarding ledge guarding and what defines a character's ability to ledge guard.