..or something that's quick and evasive, but not necessarily stealthy.
Dark Knight in Final Fantasy XI was perhaps the best example of a glass cannon I've ever seen. Capable of dishing out absurd amounts of damage, with abilities that literally drain your life and make it nearly impossible for the enemy to focus on anyone but you, all on top of paper thin defense. Samurai and Ranger could also do some nice damage, but didn't need a dedicated healer the moment they drew their weapons.
As for the latter, Final Fantasy XI again. NInja was dual weilding low delay weapons, had abilities to further reduce delay, loaded up on Haste gear and shadow tanked (ninjutsu, copy images that absorbed attacks).
Plenty of games have powerful classes like that, which is what I usually end up playing (either melee or ranged), but I haven't seen anything that's quite like FFXI's Ninja. Kinda disappointing, really. I never play mage characters.