Yeah, I have to second the dislike for large numbers of units at once in a tactics game. Although I did like the way the real-time-tactics "Close Combat" series handled it: You had 8-12 units, but each unit was comprised of a vehicle or 1-8 semi-autonomous humans. So you tell those infantry "Go here", and they all move there as one group, and line up behind the wall together, or each take a different window of the house. Above 12 units, the micromanagement starts getting WAY too much--In X-Com, I can only stand to actually move maybe eight guys at a time, if I have more than that, I end up leaving people in sniper positions, or just leaving them standing facing a wall in a safe spot. Apocalypse was pretty good with its groups, but the AI was kind of too dumb. X-Com is really tedious when you have LOTS of guys...and with a whole bunch of units, individual stats also stop being very meaningful.
The more units, the less customization. With only eight guys, sure, you know that the guy with a big sword is also awesome at healing power, and he can backflip, or whatever. With twelve guys on the field and eight more in reserve, well, you look at the class picture before you look at the name, and then you say "White mages...oh right, this one was also cross-trained in black magic". Once you get about forty people in your army, you really HAVE to restrict abilities pretty hard within a class, or it's a management nightmare and it stops being fun to track them all.
(I've had a dream for MANY years, about building a real-time-tactics game that can handle hundreds of unique guys with unique stats, but lets you define a class ie "sniper has this much accuracy", and will auto-group guys by class and it'll give them whatever title is appropriate. And then lets you say "Give me a squad with four snipers and two heavy weapons guys, and someone should have medic skill", and it'll pull guys from your reserves and arm them appropriately. The best eight guys or so at a time are always just known by their names, because they're good enough they're just going to be specialists regardless. That might actually let me enjoy X-Com type games again!..)