I like Mordheim, and I believe there are rules to be found out there on warhammer skirmish with troops from Army books and I think GW at some point released the book Warbands or smthng, that governs the rules for small battles-large skirmish types of games. These are great IMO for some sort of an intro to a much larger game, or for a siege. And when we play Warhammer campaigns, there are always things from Mordheim that we need, so the combination of the two from time to time can be refreshing. That being said, Mordheim or Warhammer skirmish are not there to be tactically challenging as much as to have fun and run half rpg half wargame campaign. On the other hand, Warhammer, what ever edition (though I am beginning to like 8th more and more) are about epic games, large armies and of course large games and epic armies.
In the end it's all just the matter of taste.
But I'd love to see some ship to ship skirmish yaaar! Think that would be both tactical and epic