My biggest mistake with the dwarven campaign in Total War Warhammer was not really playing it until after I had already spend a lot of time with other factions (Empire, Bordelaux and Vampires). Having a good grasp of the basic game world and game mechanics from those other campaigns the only challenge remaining is dealing with the strengths and weaknesses of the dwarves themselves.
Even low level dwarven warriors are very tough and tend to win battles just by standing still and letting the enemy come to them.
Dwarves have easy access to some of the best ranged troops and artillery in the game.
The dwarven economy is very strong so it is easy for them to make lots of money.
The dwarven building tree is very streamlined that and allows a player relatively quick access to high quality units.
The dwarven starting position is easy to defend with nearby access to weak green skin armies and settlements for early game combat experience.
Dwarves have a huge technology tree that is chock full of good things. You can buff up your already tough warriors to a huge degree as well as getting massive buffs to your economy.
They are slow.
They are very slow.
In the multiplayer game dwarves are considered one of the weaker factions hampered by their lack of mobility but sadly the AI doesn't seem to be able to exploit this so dwarves are a very easy faction to play. Easy doesn't mean fun unfortunately because their lack of mobility leaves you with very little choice of tactics. Dwarves play a slow defensive game using artillery to taunt enemies to dash themselves against the impenetrable ranks of dwarven warriors while dwarven ranged troops rain death from a distance. They win these battles very easily but it isn't a whole bunch of fun.
There are nice things about the dwarven campaign: The book of grudges is a lovely idea that is well executed. If anyone wrongs you (eg conquers a settlement or raids your lands) it goes into the book and gets added to the list of offenders you must punish. If the AI was better I could imagine dwarven attributes could lend themselves to some epic last stand defence battles but sadly it isn't and increasing the difficulty level just increases the number and stats of enemies not their intelligence.
Perhaps I am getting burned out of TW Warhammer. Certainly this campaign isn't keeping my interest. There are some interesting mods out there (Steel Faith Overhaul has caught my interest) but it may just be time for me to move on.