Understand how the RPS mechanics work and then play the game and figure stuff out. Grab beats block, block "beats" attacks, attack beats grab, etc..
After you have a grasp on that and how use it to land attacks, then pick a character, watch/read a beginner guide for that character, and try to have fun and learn while you're getting your ass kicked online.
You might also check out "Gief's Gym." I've heard it's a good resource for new players.
Castlevania was not even good at the time of its debut. Ghosts n' Goblins could run laps around it despite being released a year earlier...
Are you kidding me? I played through both Castlevania on the NES and Ghouls n' Ghosts on the Genesis for the first time a couple years ago when I was on a retro console kick. Castlevania instantly became one of my favorite 8-bit games, and even motivated me to play through Simon's Quest(bleh) and CV3. Ghouls n Ghosts was fun for sure, but nowhere near as clever with its difficulty or level design.
Of course it's competing with Smash, but not because of the budget. They said that they want to do with platform fighters what LoL has done for MOBAs. That's extremely ambitious.
But I'm sure Nintendo had much more than $6 million behind Smash 4's development and marketing. Saying that $6 million somehow puts them in the same development league as Smash seems like a leap. Nintendo probably spent more than that on just the marketing budget.