Starting with the Mongols, every other faction has better technology and horsearchers than them. It's simply ridiculous.
Byzantine horsearchers are better. Turkish and egypt horsearcher are the same as horsearcher. And Russians have much heavier horsearchers.
Even the heavy mongol cav is weaker than other eastern cav like that of the turkish/russian/egyptian factions.
On top of that Horsearchers in general have less range than foot archers (WTF!?!).
I also miss fast heavy cav for the mongols, cav like Conquistadores who are swift but still strong.
Mongols were supposed to be mobile and not slow. The heavy cav of the mongols in the game slows the whole army down!
The Timurids on the other hand can make up for their weaknesses (no crossbows, no musketeers, weak infantry) with 2 gun elephants.
Because of that I go with the Timurids. But I still miss a heavy cav that is a bit lighter for more mobility.
It's sad that the developers of Total War listen all the years to the millions of cry babies. It's because of this that total war is not as great and realistic as it should be.