end up dead all the time

don't like how we can't fly and don't like being gang up on by bunch of monsters.
end up dead all the time, even when playing my druid kitty (found the druid kitty to be easiest to fight with on the new island) still end up dead when gang up on.
have tried few dungeons( with different types of toons) well i should i at least tired a few never made it completely through one. new Blackrock we never made it passed the first boss spend 3 hours trying. tanks blamed healer for us not getting passed it. Tried it cheap wow gold again with different groups never made it pass the first boss. tried the grimrail we made it the boss on moving train but that was it. tried flowery one not sure of it's name. we made it up to the boss where quest pet is at (but the pet's nest doesn't work) didn't make it pass that boss up there. all of these were on normal. everyone is blaming the healer in all of this. It;s not the healer fault that blizzard lowered their healing and made monsters gang up on everyone.