Though it isn't perfect, Elven Legacy is, in my opinion, probably the best tactics game on Steam.
It is also one of the few that lets you build your army to a nice size, fielding a good dozen units or so on the field of battle.
These large armies are absolutely necessary to capture the essence of what makes for a good tactics game:
-Allowing the ability to concentrate forces,
-the ability to divide and spread to different objectives,
and the endless flexibility and mixing and matching that operating any army should be about.
Battles are very well balanced, with perhaps the exception of when (usually the AI) gets UNlimited range magic. Those few times, the entire battle experience is ruined. But most battles don't include this at all. The units are done right and everything is predictable enough to concentrate on the theory and practice of the economy of battle.
Stories normally get in my way especially for tactics & strat games, but EL's plot moves along nicely, giving you skippable events that drive you to the next fight. A few forks in the road allow you to choose different paths which adds to the replayability of the campaigns.
RPG elements like magic artifacts and hero units are useful without making the other units useless. Your units get experience that carries over for the entire campaign and may upgrade to a stronger unit type. This is one of the reasons why I mostly play campaign, because it is fun to have pride in your units and try your best to preserve them. But the game also offers scenarios as one-fight deallys, and a scenario editor, and multiplayer, all which I havent even gotten into due to being all about campaign/ story mode.
To my dismay, the game adds out of the way objectives that break up my 'exercises in maneouvre," but the game does a surprisingly excellent job in making them a tough challenge, without wanting to bash your head in. Usually. There will be some frustration if you want to get Perfect missions / all objectives but, hey, it's supposed to be tough, right.. Overall very well done.
-runs your gpu a bit hard for the level of graphics
-you can save and load at will in sp, which I very much prefer, and I don't care about peoplw who whine about 'save scumming'
-full voiceovers for the story parts, not too bad at all
If you want a tactics game that offers a lot more possibilities than a 5 man game can offer, your best bet that I know of is Elven Legacy, and the earlier game done by the same guys, Fantasy Wars, of which everything in this review also applies.