You make it sound so easy, like it was a walk in the park and you didn't put any effort at all. Does Noble give absolutely no challenge to veteran players like you?
It depends what you mean by challenge... Noble can offer plenty of sun challenges such as trying to launch the space ship by a specific date, or these competitions, where the goal is not just to win, but to do so the fastest, or with the highest score. However, if you mean does the Nobel AI provide any challenge to an experienced player winning the game somehow, then the answer is simply no...
On Noble, and even Prince, planning and high level strategy is not needed to garantee a win. If you just do the basics right (which will come automatically to an experienced player), then that will be enough to over power Prince and lower AI in all aspects of the game. By basics, I mean:
-Good city placement.
-Decent worker management to get the food and then the power tiles ready.
-Some basic chopping/whipping.
-Unit stacking for war.
-Proper tech trading.
-Picking an efficient tech path.
Even at Monarch, the above is sometimes enought, depending on how good your start and the map is, but often Monarch maps are tough enough that some higher level of plan is needed to make sure you dont fall too far behind.... At Emperor, the AI start to need to be really taken seriously.
The big reason for this is speed to Feudalism... In war, the AI is bassically defenceless until he gets to Feudalism (Longbows). Once he has those, his cities are hard to take, but until then, cats plus just about anything will take cities efficiently. So in the caveman-rush-the-AI approach, the question is how much damage can you do before Feudalism comes on line. On Noble/Prince, the answer is quite simply more than enough.
In this game for example... I settles the capital, and built a city near the elephants, and a 3rd city on the pinincula... Capital gor granary, library, barracks and Moari. Elephant city got granary and barracks.... Then I started building cats, elephants, and the odd swords... Early captured cities for a granary, and then build units. Later captures just built units... Nothing else.
Units were selescted pretty much at random between cats, elephants, horse archers, and swords, with the odd axe and spear trowns in. New units moved towards the front (Northwards and Westwards), and attacked anything that moved... Even agianst such a primitive rush, the AI offered no resistance what so ever (Even at 1000 AD, Noble AI cannot defend themselves against such a basic stack.)