Puggins
Explorer
Giving Fighters "swordball" instead of fireball and "mundane missile" instead of "magic missile" and "crossbow bolt" instead of "lightning bolt" isn't, in my mind, the way to go.
Fortunately, the 4e designers thought so too. Fighter exploits are vastly different and far more understated than wizard spells. Some higher level exploits start doing things that might seem fantastic, but 3.5e had that too- whirlwind, for example, which has an analog in the fighter's arsenal. But there is no "swordball" or "crossbow bolt," or anything even coming close to resembling them.
From the comment you made, I think it's reasonable to infer that you haven't actually played 4e, at least for any substantial amount of time. If I am wrong, my apologies.
In practice, the classes play drastically differently. Thus far, I have seen six of the eight in the PHB, and they are all as stylistically distinct as any two 3.5e classes were. The 4e paladin plays very differently compared to the fighter. The rogue plays very differently compared to the ranger, and none of them play at all like the wizard.
I will say that the format in which they are presented makes the classes appear to be homogenous, but appearances belie the feel of each character in actual play.