Yes, more often than not Dshars seem strong in early, because of the overwhelming cav, fast infantry and acceptable archers, many times to the point that i have to vassalage for Empire or Orcs just to save their sorry arses for later, so i can pawn them myself.
But, once the game deepens, i recommend trying a easy little scenario:
Take on a Jatu/Noldor/Serpent army using each factions troops separately. You will notice that Sarleon/Pendor/Empire stand a good chance. Fierds and Raves require good management (and perhaps an understanding of the AI's flaws in desperate situations
) to manage a win. While the Dshars will kinda let you down. Of course, if you roleplay a Bayazid approach and want to reinstate the eastern empires, you will build some nice really heavily armored warhorses tanks and complete the Dshar destiny, but if you only play factions bare-ass, all troops included be them nobles or not, the balance changes.
Personally, i believe Pendor lines and Empires lines to be complete and the strongest from the player's point of view and leave little room for the imagination, with every top tier unit line being the strongest in its field, xbows, halberds, legionnaires, good archers and stable shields with pierce etc. completed with the outrageous SLCs, Immortals or the OP Pendor noble line respectively.
Tbh, the simple fact that Pendor seems different to most of us speaks about it's well implemented balance. Perhaps in the end it is a matter of luck and style of play.