I'm A Banana
Potassium-Rich
Well, if you really wanted to play a nobody who starts as an incompetent dirt-farmer who advances to player-character hero class, you should simply use the minion NPC rules for yourself.
But then we still have the problem of swingy 1st-level combat.
After all, some awkward players also took NPC-classes like Expert, Commoner and Aristocrat to show how weak their character was (some even dared to claim that they were therefore better roleplayers... Hah!).
Sure, but this is a completely different issue, more related to the "narrative flow" of D&D levels 1-30 than about any kind of high numbers.
Effectively, you have to reconcile these two facts:
#1: PCs and NPCs operate under different rules.
#2: People want to play characters that are "no different" from NPC's, at least at low level, and who then grow to become something different.
4e completely disregards the second part of that, using previous editions as a guideline and guessing (perhaps correctly) that people want to play heroes all the time, and never really want to play dirt farmers who go on adventures.
Using minion rules for PC's just re-introduces the problem of swingy 1st level combat, which isn't something that has to necessarily come with "being like a commoner" (as a few other posts have pointed out).