Overall, though, I'm not very happy with fairy types. Every time my Gallade gets Dazzling Gleamed I scream.

So Gallade has weaknesses, this is news? What about when your opponent uses Shadow ball or Drill peck? Does that not equate to roughly the same thing? (all moves I just mentioned have 80BP)

Only issue have with Fairy is that it resists Bug. Did Bug really needed another type resisting it? The answer is no. Remove the Bug resistance and give it another weakness and all will be golden.

This is far from the only issue, but let's start there. It doesn't need to resist bug when so many other types do. Fairy completely nerfed bug in two ways: offensively bug has another resist to deal with and also became redundant with Fairies being SE against Dark-types, which is what bugs do but not as well. Fairy should really resist itself, too. Not to mention if Grass resisted Fairy it would also be slightly more balanced and make sense in terms of lore (since fairies don't harm nature, they cultivate it).

So, there's another OP type. Doesn't give Fairy the excuse to be OP as well.

And what about Ghost and Electric? This isn't something particularly uncommon, so it's not really a good argument for whether or not something is OP.
Ghost has its struggles offensively... Electricity struggles defensively, it barely resists anything and most Electrics have low defense to boot. Water and Fairy are the major offenders in that regard.
Since this got brought up, and the whole issue is about balance, let's examine these too. Ghost is strange. Defensively very useful, but weak to itself?? Now only one offensive resist (Dark). It doesn't struggle, that's for sure, but it could seriously use some tweaking. Maybe another weakness, another type that resists or resist to itself and another SE type (because psychics are nowhere near the big threat they used to be.)

Electric could use another weakness, because even with Equake's popularity there are many who have flying type, levitate or magnet rise, and three resists isn't bad. Offensively it does ok too, really it only hates ground and other electrics.

Water. Water water, everywhere, yet not a drop to sink. It might need one more weakness, but i don't know about that. Water's prominence is what gives grass & electric such niche use offensively, but maybe poison if you want to make that more offensive. Really i don't see why poison isn't more offensive, given that poison weakens life of very many creatures (including us!!)

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