Well. I actively hated Dwarfs for a good 23 years before going in completely the opposite direction and becoming a Dwarf fanatic just this year! So this is a really good question! Settle down folks, and let me tell you the tale of how I became a Dwarf player…
To start with, I had always disliked Dwarfs because they never matched the style of play I preferred (ie. Mobility and/or Hordes). They had a reputation for being a boring army (slow & shooty) and I really didn’t like their background (short & stubborn). Having a Night Goblin army in Warhammer Fantasy only cemented my hatred for them - how could I possibly consider playing the mortal enemies of my cunning Nite Gobbo Horde?
But as I got older, my attitudes changed. My “preferred playstyle” got alot broader (ie. literally any playstyle is good by me). Army background also became far less important - the story i created and approach I took to customising my own army was what was important to me.
Then came the catalyst. I won a Mantic Dwarf Army box at a tournament, and I had a vision. The ultimate transportable army, made up of stackable infantry that could easily be stored without bulky toolboxes or fragile trays. The “IKEA Dwarf” army was born.
Actually starting the army was a challenge. It took quite a few tries to settle on a colour scheme that I both liked and was ready to paint. Then I got distracted by another great idea and painted 2500pts of Trident Realms. Whoops. 
But when I properly started building this army a year ago, it progressed surprisingly fast. I enjoyed painting them and the army looked good. And as I progressed I started adding more “high tech” elements to further customise the army - to make it “mine”. It started with 40k Kroot Rifles to convert my Sharpshooters, but rapidly extended to other units as I delved into the Malifaux and Forgefathers range.
So I had an army I was proud of, but what really pushed my down the rabbit hole of Dwarf fanaticism was the background.
You see, Mantic has the best Dwarf background in tabletop gaming. They have all the standard tropes of stubbornness, technology and general dwarfishness. But what really sets them apart is their tendency toward xenophobia and authoritarianism. You see, on the surface you might think of the Dwarfs as a force for good in Panithor, and that might be true for the Free Dwarf folk. But the Imperial Dwarfs are absolutely the Bad Guys. They conquer territory, look down on other races and tolerate no threats to their way of life and importantly, their rightful ruler King Golloch. I genuinely love that added depth Mantic’s given to the Dwarf race, and it’s that subtle subversion of the expected tropes that made me such a huge fan of the race.
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TLDR: Mantic Dwarfs subvert the tropes of regular fantasy Dwarfs, which makes them amazing. 