Yes, Roman logistics and administration was probably what made them an empire.
I always used to say that Roman talent was in improving things initiated by other people and running it more effectively than anyone else before them. The greatest and most efficient copycats of Antiquity.
Maybe not the most flashy approach ever, but it got the job done.
Personally, I don't find Marian legions boring. There's some appeal in uniformity once you finally get there. Also, M2TW engine can get them right. On RTW engine there's a faceless army of clones (well, every unit of every nation is that way, but Romans have it further accented by their not so flashy and very utilitarian kit).
Now it's possible to have some variations in helmets and shield paints so they don't look that Hollywood.