First off: my username is 'Dachs', not 'Dach'. Dach means roof. Dachs means badger. Secondly, learn what 'Megas' means in Greek. Hint: it means 'the Great'.
Ok Dude. What is with that tone though ? Certainly rude. You thought the

Because 'best' is not well defined by the OP. I chose to see it as rulers who make history interesting, as well as ruling well.
This clear things up but i don't see how making history interesting has to do with being the best but , i still find your post interesting even if somewhat off topic...
This is the same Hadrianus we're talking about that spent a significant chunk of his time fiddling around with Aristonous, right? Dude crushed the Bar Kochba revolt ably enough, I will admit, and abandoning Mesopotamia was sound. But personally I think that Aurelianus and Septimius Severus were better Emperors, while Gallienus is one of my own favorites not for skill - which he did have, anyway; having to deal with the era of the Thirty Tyrants was no picnic, and somehow Rome wasn't utterly destroyed during his tenure - but for the story that he made and for being underrated.
Well the Handrian Wall must count for something ? IMO it is one of achievements which it;s positive effect may not have been calculated in the margin that it should...
Though i could be wrong.
Are you reffering to Marcus Aurelius ? He was a good emperor but i choose to hold against him his decision to select Commudus for his heir. It just does not feel right for me becaue Marcus Aurelius did bring Commudus with him in the field and he should had been aware that he was not fit for the job.
Hmm I will google him. Colbert ? What kind of a French name is that ?Colbert was a pretty good minister, too. Unfortunately (or fortunately?) his attempts at total state control of seaborne trade were a bit...impossible...? But being the father of the French navy and an able financier has to count for a lot, and it does.
Anyway i enjoy the discussion...