Liquidsabre
Explorer
PCs aren't meant to go toe-to-toe with a giant in an all out slugfest, its playing to the giant's strength (not to mention a little insane
). Any well seasoned adventurer will be able to tell you you've got to adapt your tactics, as has already been pointed out a gaints poor will and ranged attacks are your friend.
SeveredHead has it right about the falling off of the overwhelming toughness of giants at around 10th level or so. At this level more tactical options tend to be available to the PCs that allow them to take the advantage in a combat: the fighter is more likely to have boots of flying and a good longbow, a wizard can cast and stay invisible, the rogue can't be found, and the cleric just cast's sanctuary and stands around summoning powerful summoned creatures. Usually (especially with more experienced groups) most everyone won't let themselves be caught in the open or vulnerable by the high damage-dealing of the giant. Either that or they are a buff/insane barbarian dude with nearly 200 hit points and a 2-handed legendary sword!

SeveredHead has it right about the falling off of the overwhelming toughness of giants at around 10th level or so. At this level more tactical options tend to be available to the PCs that allow them to take the advantage in a combat: the fighter is more likely to have boots of flying and a good longbow, a wizard can cast and stay invisible, the rogue can't be found, and the cleric just cast's sanctuary and stands around summoning powerful summoned creatures. Usually (especially with more experienced groups) most everyone won't let themselves be caught in the open or vulnerable by the high damage-dealing of the giant. Either that or they are a buff/insane barbarian dude with nearly 200 hit points and a 2-handed legendary sword!