Fantasy General is a very dear game to me, particularly because it evolves and improves the basic PG gameplay with some clever additions, hero units, basic spellcasting and varied enemies. It also manages to give the player a wider set of tools and space to apply such tools: one of the typical failing of PG clones is the almost fetishization of the "puzzle-like" aspects of the original games, with time limits and unit limits hitting hard on player choices. Panzer Corps is particularly bad on that regard, I remember that I could not be bothered to play it more than a couple hours. One point needs to be made, the last "island" of Fantasy General does feel too much like a waste of time, being essentially "your princess is in another castle, grind another island with the same setup with most of your units already maxed".
Fantasy General II is a different beast, but as a relaxing TB games with some PG inspirations it works fine. Campaign design and unit design improved for every new expansion they threw out, but even the baseline game offers some clear replayability, interesting scenarions and amusingly enough some clear C&C stuff - you get different units and different "unlocks" depending on your actions on the campaign, heroes gets different traits, items are useful for some amusing builds. It's nonetheless an evolution of the PG style and not a stale copy.
Armageddon.... everyone else said it, it's a decent effort for the first campaign and then it collapses completely when Titan and Super-Heavy units get thrown into the mix.
Rites of war is a cookie-cutter PG clone. But you get smug Eldar campaign and the campaign is unarguably well designed, with a good use of the enemy roster. Better than Armageddon for sure.
Enjoyed PG1 for what it was, Allied General was an insane slog for the Soviet campaign - I swear I almost popped a vein on Berlin, the amount of everything the Germans get when you're given inferior equipment, inferior numbers and inferior positions is rage-inducing - but the other Allied campaigns are better and more varied.
Also, Fantasy General 1 soundtrack: when it's so good they had to recycle pieces for the sequel.