Each faction is intended to be played differently and all have their different strengthes, weaknesses and different strategies. Some are better at spam, lategame, map control, and so on.
So it's likely some factions fit your prefered play style better and others worse. But that is an intended byproduct of each faction being distinct.
But we are actively trying to enhance factions that lack the versatility of strategy options, like Isengard. Thus it will get some nice improvements in the variety of things it can do next patch to make it more interesting.
If you are having problems that your units always leave the castle walls, give them the order to hold their position (keyboard key S)
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