Wait, you use the pre-fabricated classes? Never, never, never do that. You can make a better class yourself.  That's why I recommend a High Elf mage with the Apprentice Birthsign and hand to hand. Sure, you die in one hit if a fireball even grazes you and you do roughly 2 damage when punching people, but think of all the mana! Plus, at points when any other type of character would steamroll through the game, you will always have a challenge at your hands!

I always custom build my class and tailer them exclusively to doing massive damage using basic attacks, I killed everything and everyone with light attack! True I had to buy as many healing potions as I could find but thats because of my tendency to run towards the most dangerous thing I can see, its more fun that way.

like they said :P always custom build for how you want to play

You see, your class in Oblivion is like a bus. You don't get to choose where it goes, unless you make your own class. In that case, you can choose exactly where it goes. Where do you want the bus to go? 
 
I'm a RoboDemon (haven't played in forever though), who is great with swords, shields, healing magic, running and jumping, and shit like that.

Don't let anyone fool you- unarmed combat is the way to go.  Nothing more awesome than sending all those abominations from Oblivion back where they came from by just punching them until they stop moving.

I'm always spellsword. Its just easier that way.

Build your class so the skills you use the least are your major skills that make you level up. Put your less commonly used skills as minor skills, and the ones you use all the time as the rest. That way your character will have higher skills at lower levels and you will actually get to (have to) develop and learn skills you normally would avoid. There's a bit of a grind to level up sometimes, depending on what you pick. But your character will be worth it.
 
It also helps keep you from leveling up when you don't want to yet cause you haven't made enough progress in strength or whatever to get the three extra attribute points you were going for.

try to model your character off of characters from other fantasy media. 
for example; on one playthrough of oblivion I made commander vimes. on another i made jon snow.

" @davidwitten22: You love that bus analogy, dotn you? "

I think you should make a bunch of classes and experiment a bit until you find something you like.

" Also, I kinda cheated when playing this game to level up my Armor abilitys. Basicaly, I dumbed down the game to rediculous easy, then I just had them hit me for like 10 minutes to level mor armor. Im not sure if this is a great way of going about it. Also, what difficulty should I be on? Since its a slider, its kinda hard to tell. "

I almost always play Assassin/Thief type characters. The Assassin can use Light Armor, you can make healing potions (as well as poison and other shit) easy with Alchemy, use Blades, plus your sneaky as hell. 
 
http://www.uesp.net/wiki/Oblivion:Classes    <----That may help.