Plane Sailing
Astral Admin - Mwahahaha!
Hammer Rhythm is what makes a high-con fighter work.
So you think that a high-con fighter can't work in heroic tier?
I've got empirical evidence which trumps this theory

In all seriousness, whatever else the 4e designers did they made it pretty difficult to make an ineffective member of any class. Of course someone can focus on optimising Strength and getting this neat feat with that neat paragon path and so on... but that is largely a paper exercise as far as most people are concerned.
The fact is, you can have a fun character with almost any set of stats. Perhaps it is because I come from a generation where typical character creation involved rolling 3d6 in order and then deciding what class you would best fit...?