Since I've never played Smash Bros. offline with anyone near my skill level, I have no idea how good I really am - though I can take a decent guess that I wouldn't be able to beat anyone with a properly competitive mindset. That said, as a point of comparision, here is a list of other game-related things I've accomplished: (any hard numbers are probably out of date)
I've cleared the 1P Game of SSB64 on Very Hard (albeit needing all 5 stock), a run that included earning No Damage versus Master Hand.
I've beaten Events 50 and 51 in SSBM with every character.
I've collected all trophies in SSBM (that can be obtained without hacking).
I've cleared the Subspace Emissary 100% on Hard without stickers.
This user couldn't care less about "fashion" or what's "in".
This user is astronomical.
This user is persistent, albeit slow.
This user can't stand entitled brats.
This user is sensitive to smells.
This user has no hygiene and doesn't care in the least.
This user does not like ties.
This user believes that Banjo and Kazooie deserve to be Smashers.
This user likes predictable sequels more than change-for-the-sake-of-change ones.
This user drinks a lot of milk.
This user has a big head.
This user has two distinct personalities.
This user has a nonzero amount of ninja.
This user has both too much and too little power.
This user works best alone.
This user is a klutz.
This user sees "kiddy" and "family-friendly" as sour grapes labels from supposed "hardcore" gamers.
This user is faceless.
This user drops the hammer.
Only this user has the brains to rule here.
This user thinks a cloned Final Smash is among the worst possible insults to a character.
This user has never played a game he thinks he couldn't improve.
This user is ambivalent towards ketchup.
This user has an extremely powerful musical mind.
This user thinks it's rude to remove playable characters from future fighting games.
This user is the original, not the duplicate.
This user is super effective.
This user dislikes water.
This user hates the outdoors.
This user chooses preference over performance.
This user dislikes traditional fighting games.
This user hides in the shadows.
This user is male.
This user is a nonconformist.
This user is a wimp.
This user is vulnerable to low temperatures.
This user prefers to remain at a distance.
This user respects the timey-wimey.
This user has annoying sweetspots.
This user has no sympathy.
This user has a large vocabulary.
This user hates games with any more than a single canon plot.
This user is probably of the last generation that can appreciate the offline world.
This user has an arsenal.
This user tells it like it is.
This user is a good guy.
This user has a scientific mind.
This user is bad at hardware.
This user has reflexes.
This user has large pockets.
This user really shouldn't be alive based on what he eats.
It is this user's duty to suffer in your stead.
This user enjoys your failure.
This user will taunt you.
This user once had a huge cardboard box.
This user likes shenanigans.
This user dislikes paranormals.
This user thinks inescapable combos are fundamentally unfair (in multiplayer games).
This user thinks science went too far.
This user is less likely to play a game that sells itself with sex appeal.
I don't do this like most other users around here (though many have since stolen the format). Basically, this is how well I feel I play with each character in combination with how much fun I have playing as the character. Characters are also not sorted within blocks.