Haqqislam were my first and still favourite faction, like you I just went for them because of the miniatures, but they are really fun to play to.
A few pointers about them from my own perspective:
- As Loki says, they are very hard to put down, and very tenacious. In the background we are told that they don't fear death, many don't carry cubes, and they play like that on the tabletop. Having 'dogged' troops like the muyib (I've lost count of how many times mine have made a kill after being mortally wounded themselves), regenerating Djanbazan and excellent doctors all help to make up for the perceived weaknesses of the force (like possibly their lack of heavy armour - although they still have some!) and make a force that can stick around. Having lots of religious units as well means that you might just be able to turn that loss into a draw once the casualties start mounting up at the end of a game.
- As Alkasyn says Fidays are so much fun to play - they aren't even that expensive in points, but they are worth it just for the fun of using them, and the way they can be so annoying to your opponent!
- Good specialist troops. You can find a specialist for any task - an
HMG wielding Janissary to act as an anchor in your line, the sniper Lasiq for one of the best snipers in the game, the Ragik as excellent drop troops. The Muyib is also many people's favourite, not because they specialist, but again because they can occupy many different roles also.
- One of the coolest TAGs in the game in the form of the Maghariba Guard.
Overall I think they are a great force, with many different play styles and approaches that are possible.