Here's what I posted in a similar thread (I'll post it almost as is again because I'm lazy
)
It's best to know what you're looking for, and since I'm not here to advertise, here are a few things that you should expect to find.
so regarding FO1&2:
They are old, they have ugly 2D graphics, they're turn-based(!), they're isometric.
They have very little spoken dialog (you will have to read most of the time).
Your companions are very likely (in fact - certain) to hit you during battle, while, unless you are really good with your weapon, you are going to be missing most of the time.
They need absolutely no 'physical' skill from your part (such as reflexes or precise aiming) to beat, you only get to click with your mouse and that's it .
You get no information from your journal about the quests other their title and there isn't even a compass or anything to help out a bit.
They are punishingly difficult early on.
They just can't take themselves seriously, especially FO2 - throwing all sorts of comical messages and easter eggs all over the place.
They have extremely few mods.
All enemies of the same kind look pretty much identical, you can't even see their faces.
You only get a perk every 3 levels.
There are no elaborate joinable factions, though there are some but they don't have long questlines or anything (even the BoS has almost one quest).
If you are ok with all that make sure to buy them because they are two of the very best cRPGs ever made.
...and well... I haven't played Tactics. Though of course it's not an RPG but a tactical 'strategy' spinoff, as it's obvious from it's title.