Garthanos
Arcadian Knight
Reply to OP.
Maybe Spellcasters are more versatile than martial characters, but I would argue that the more versatile Spellcasting classes work best, and more importantly, are remembered, as support characters.
The favorite memory that my old group had of my old Sorcerer was not the innumerable fireballs or wall of fires I dropped.
No. It was when A) I counterspelled a death knight's destructive wave, and the DM was reduced to hysterical laughter, and B) when I quickened polymorphed myself into a giant ape and then threw the barbarian like a baseball at the Balor demon we were fighting.
My favorite memory of me and my dad's homegame is not when his wizard finally dropped his first fireball, but rather when his wizard levitated the barbarian, Druid, and rogue up to the second story of a serpent temple so as to pursue the evil priestess.
My favorite memory of playing with our new group came just last night, when our new group was fighting an Ettin and a "Hell-Bear". My Half-Orc War Cleric cast a humble bless on the Dwarf Fighter, who promptly wrenched the maul out of the Ettin's left hand and fearlessly soloed the Hell-Bear like a total badass, knowing that if he went down I would simply heal him back up.
Some people definitely like support characters and enablers... this and being very team oriented design is one of the reasons the Warlord was popular.