ZSS has a buffered chaingrab on half the cast, a stun lock on the Space Animals, and the newly discovered infinite on ROB. She's a tough competitor against any character besides Diddy, Luigi and Peach.
But yeah, back to Falcon.
What makes a good Falcon? There's many different things you could do to point out a good player from a bad one, but Falcon is a bit more complex than most of the roster. Lets take a look at Captain Falcon's moveset. Majority of which are attacks with low-mid power and knock back potential and can easily be followed up by another attack.
Example; Jab -> Jab Cancel -> Down Throw -> Aerial of Choice.
Any generic player would immediately attempt to perform an attack such as the Knee of Justice over and over throughout a match, like I used to do myself. There's a distinction between a character that can PERFORM things with ease, and those who can use them efficiently to kill. Where one player may attempt to use the Knee a good number of times in one stock, another might see the best choice as to save the attack for a kill move ONLY to prevent stale moves. A well placed knee should easily kill at a percent such as 85-95% on most characters (taking DI into exception) if it was unused during the match, where someone who used it multiple times will be having trouble killing with it around 120%.
You must also take into consideration that Captain Falcon, despite his ability to combo at low percents, can't be guaranteed a simple kill in Brawl like he could do in Melee. So, its a player's choice; Attempt the punishable and try to do flashy things the entire match without getting punished, or savor the stylish moves and mindgames for when its time to kill.
Personally, I would just play it smart and safe, throw a few weak knees in to topple the opponent over and then laglessly run in and get a grab or something else in on them before they have time to react. Use things like the sides of the stage for wall jump attacks and various mindgames. Abuse Raptor Boost and follow up with a uair or nair (since both have range and a long lasting hitbox). Also, you don't need to be too stylish when you can damage someone's ego with an inescapable combo.
Jab -> Jab Cancel -> Down Throw -> Show me your Moves.