The thing is, most people don't realise that Monty was a fantastic general because he ISN'T as famous as others.
Don't get me wrong, but not being famous doesn't necessarily translate to being fantastic. I can easily see Monty being a decent general, it's just hard to see those amazing saves or such from him. However, I'm more than happy to learn more!
Of course, if one has less troops and materiel the great moments are more easily visible than if you fight someone who is at a disadvantage. And in some cases great feats performed by subordinates get credited to the higher-up leader.
As an example the finnish marshal Mannerheim is/was almost worshipped in Finland for a long time. And reducing him to a mere mortal was almost a taboo. However, as it turns out, he truly was an old-guard raised in russian imperial army, and had a good deal of fear of Russia in him. He also displayed some hitlerian elements that made him a less of a leader: he was ill-tempered and a true procrastinator. On top of that he apparently really liked his schnapps.. Not such a legendary leader of men really, but due to his prestige value from the struggle for the independence and the following civil war, he was the necessary figurehead at the very least.
And one has to remember, even a broken clock is right twice in a day.