Not completely true. Togekiss is good, but the Psuedo Dragons can still hurt her. I mean they have a lot of power in physical attacks (With one possible exception, Hydreigon). The others can do some brutal damage to her still. Then there are the Bugs that outspeed it like Volcarona and Galvantula who can whittle down on its health or even take it out if done properly. Scizor can probably contend with her using a Technician boosted priority attack like Bullet Punch while holding a boosting item like Life Orb or Steel Gem/Iron Coat. Durant can probably hurt her as well.
Depending on nature and items a Dragonite is the same speed or can be faster than her. Hits hard enough and if has Multiscale can most likely survive a hit. 134 ATK vs 95 DEF. Thats almost enough to one shot is I remember right back when I was doing Hydreigon's damage from Gardevoir's Fairy Wind. It was strong enough to almost KO it and even with double damage, it still would have done a large amount of damage. If the move was stronger like Iron Tail, it has potential.
Salamence is in roughly the same boat as Dragonite. If boosted by a Moxie kill, Togekiss is screwed.
Garchomp has less attack than them, but still just as deadly and has access to some killer rock attacks like Stone Edge. Hydreigon is the worst off of them all, but still outspeeds her and even with 105 Atk he can still do some damage.
The Fairies will be good Dragon checks, but stat wise to majority of them they won't be much of a game changer really. The retyped Pokemon are going to be pushing a majority of the defense in the Meta game renovation, though most still won't be able to take on alternate attacks from the pseudos who are all mostly dragon....This is also, not taking Lati@s into consideration.
Heatran will also like his Fairies extra burnt with a side of mashed XD
Overall I'm not impressed with them. We've got contenders, but I wonder if its enough with what we have so far.