It was a uniquely elegant and customizable design, and had the misfortune of being in 3e.
I think there's potential in that basic design. Better feats, no +11/+6+1 and scaling saves. Something like the SWSE soldier with 4E or 5E engine.
Just looked a 4E again and yeah they essentially stretched 8-10 levels over 30. Their level 29 dailies are roughly a 5th level spell in 5E.
E6 accomplishes sonething similar.