Just Cause
Almost any time you give me an action game I'll finish it, but I haven't never beaten one of these. I don't hate them but they're too long and I get bored and put it down and play something else.
Agreed. From the ones I've tried it's all same-y gameplay wise, mindless shoot & run gameplay experience, it's fun at first gets repetitive too quickly. Maybe only for short bursts, and not something you'd play for more than a hour.
Elder Scrolls and Fallout series
I can tell these are cool games but never gotten really far into any of them. I think the way they handle the rpg elements are a turn off for me, but I've beaten my fair share of rpgs.
How dare you!
Srsly, the amount of lore on those games is unmatched, gameplay & sense of immersion too.. If it's a difficulty issue, one could always lower the difficulty until he gets comfortable with the gameplay/mechanics etc. A warning though, they are lengthy and even more so with the DLCs.
Also if the vanilla experience of either of these games is unsatisfactory, there are always mods to "improve" it.
The Witcher. I have had the entire trilogy on my Steam library for years. I have heard they are great games and all, the setting definitely looks interesting enough for me, but for some reason they never seem to call for my name, Kek. Maybe one day, eventually.
The first 2're definitely rough in terms of gameplay. Even the 2nd one, which I tried many times, i find the combat just very clunky.
Iirc the first is being remade by CDPR, so im holding out for that instead.
With Pokemon games the older generation games are much better than current generation, I would recommend starting with gen 1 if don't want to try firered/leafgreen, try red/blue/yellow.
FR/LF over the OGs (when it comes to Gen1) unless one already experienced those and looking to play the OGs.
As for the Pokémon i'd recommend as entry point, either HG/SS (Geb2/4) or OR/AS/Emerald (Gen3).