Haha ! At least, you weren't playing Falco in Melee, as I was. Not only he changed a lot in Brawl, but they decided to change him again in Smash 4, making his signature attack useless: his down air now has latency before spiking and has a huge landing lag.
And they didn't take away everything good Marth had. At least he still has tippers.
And yeah, I agree that sometimes, your main chooses you. I tried to choose Lucina at first but one of my friends was always winning against me with his Mii Gunner, or when I was winning, it was a close win. Then I tried Captain Falcon against him after not even a week of training. I won. Twice. Three times. I kept winning against him. And now it's the opposite of what it was with Lucina, I always win or when he does, it's a close win.