the idea is that if a character is more broken than others, then we should bump everyone else up to that level, not pull that guy back... obviously, we'll sometimes take back something we maybe shouldn't have given the character, but in the long run it's because it just doesn't fit right and it would be too hard to bump everyone else up to balance
....in pikachu's case, he doesn't have a large amount of differences from his vbrawl version:
his thunder bolt (neutral B) is a little stronger, his side b is a LOT stronger (but not very easily transition able), his upB can move twice in the same direction (actually really helps), his back air is definitely a lot different, and his down b, power wise, just spike now, but is jump cancelable, so easier to use... but compared to characters like jiggly where moves have been even ADDED (like selfdestruct) and sing is so much bigger, and her comet punch is also a thunder punch, and her down b heals, and her rollout is interruptable, and her down air fastfalls (same kinda change as pika's helicopter), and her jumps increased, and her smash forward A jumps further, and her down smash does a vacuum, and her taunts do awesome things, i just feel like pikachu (and diddy kong), haven't been changed as much as other characters
of course
Marth isn't MUCH different either, but he's gotten a few new tricks, like his side b reset, his side b's element attacks, his neutral b's momentum, etc,
AND he was already pretty high up on the tier list, so it wasn't like he needed too much... but i still feel like being able to keep the charge from his neutral b, for instance, could really bring in a change that would give him more variety of move plays... and i'm always going to be bringing up ideas for characters who i feel have one trick needed to feel a little more minus-y