I think I'll finally try Jagged Alliance 2. I liked Fallout Tactics a lot, lilura praised it since forever, the famous game reviewer from Balkan always derped about it, = must be great.
JA2 is basically a campy Soldier of Fortune magazine turned into a squad-based strategy game (calling it a RPG is too much of a stretch). Quests have really poor replayability, fighting swarming AI gets kinda boring, and it has a certain grindy flavour to it. Despite what the Codex circlejerk might tell you, it did not age well. Most criticisms you often hear about FoT are much more noticeable here. Unless you have a high tolerance for inventory management, poor level design (made worse by being a 2D game with verticality) and micromanaging tons of characters, you're better off playing Silent Storm instead.
Don't even think about installing the 1.13 mod during your first playthrough, it's an overrated and overcomplicated junkyard of content that offers a very different experience from the vanilla game. Think of it as an overbloated milsim in a poorly-suited engine rather than an unofficial patch to JA2 like what the name would suggest. It has tons of retarded shit in it like the infamous Drassen Counterattack, nerfs to stealth and your mercs FoV, tons of samey weapons that are poorly distributed and ruin the original game's nice tiered weapon progression, drastic inventory changes that break the balance and lead to you autistically micromanaging gear for hours straight, etc. Even if you like the idea of playing an ultra-realistic and ultra-autistic game about micromanaging high numbers of mercs, 7.62 High Calibre with the Hard Life addon does a much better job at it than this mod.