- The excessive detail (in troop characteristics, weapon bonuses, etc.) make it both easier and more prone to having a role playing game feeling
- It still handles a breadth of scale from handful of miniatures to small hundreds
One of the weapons was a Frenzied Blade.
In Dragon Rampant, to take a counter example, things are very much abstracted. You can build a narrative using the fantastical abilities, the various troop types and the Reduced Model rule. But actually the number of levers which are available to twiddle are fairly limited. This has a lot of good things going for it - the game can be more balanced and less open to abuse - but at the end of the day units end up somewhat alike and it's harder to really feel you know a character as an individual.
Back to the scenario: the Frenzied Blade wielder saved my bacon at a crucial interval (frenzy being a bit of a monster when it comes off) and looking back he becomes one of the key narratives that emerged from the game. There were also several other narratives, actual and potential - an interesting wizard duel, and the barbarian horde being held off by some seriously unlikely dice rolling. But those two factors - the detail and the breadth of scale - are what made the scenario truly memorable.
It can so easily degenerate into Herohammer or a "win in the army design" mess, but with a good GM and scenario Warhammer Fantasy Battle still seems, in my admittedly limited experience, hard to beat.