Don't go into this game thinking it's like the previous two games. Tactics focuses on combat more than RPG elements, which might be apparent from the name. If you enjoy the combat or similar games (xcom, jagged alliance) then it's a decent game.
Weapon variety is great compared to the previous games. Different ammunition available for weapons is a nice change, can't remember if the older ones had this. Hub system is a nice new addition, especially because it doesn't come with any dreadful base building mechanics. Realtime combat makes encounters faster and if you play on easier difficulties you can just use realtime all the time.
Vehicular combat is a hit and miss, personally I don't understand why designers bring these to action games. Just go make a separate driving game.
Apart from character development there's not many RPG elements. Quests don't really have choices, it's either you do it or don't. The ending mission has some options, but even it feels like your previous actions don't really affect it. Just shoot everything and don't even think about asking anything, supersonic lead is a question in itself.
Old RPG caveats apply. Have multiple saves and save often. It is really easy to brick your save by getting oneshot before the save finishes or just saving to a bug that deadlocks the game. Stability is okay, maybe five crashes during the whole playthrough.
There's a bug in the final mission where you need to nuke a door. If the timer goes to negative and the bomb doesn't go off then load a save where the timer is still running and run down the clock on turn-based mode. If you don't have a save then you're fucked, enjoy replaying the whole game.