Limited Classes
Limited Romance
Limited Height
Limited Companions
And they're not a very compelling group of individuals. You have Qunari and their Qun, Dalish and their Elven Gods, Humans and...their everything.
But Dwarves come from a darkspawn-infested hole in the ground filled with horrific politics. That sums them up for me.
Plus look at companions.
Oghren, Sigrun, Varric. (Shale, if you want to count them although their character primarily revolves around being a Golem.)
I can count the number of dwarves that joined my party on one hand.
Elves?
Zevran, Velanna, Merrill, Fenris, Sera, Solas. Elves get better representation as a whole.
Qunari? Iron Bull and Sten are powerful windows to their culture.
Humans? Wynne, Morrigan, Leliana, Nathaniel, Alistair, Loghain, Anders, Isabella, Aveline, so and so on.
And we've never had a Dwarven romance. Not once. Qunari romance, yes.