I have memories of FO3 being amazing, but when I try to start a second playthrough, it just feels like a slog and it doesn't pull me back into the groove.
FO:NV may be the exception, I remembering doing a solid handfull of playthroughs. Have not done so in ages though.
FO4, I got as far as The Institute and ran out of steam, and for the life of me I cant make it make it past the museum in an attempt at a fresh playthrough.
FO 76. I can't even make it down the hill before I get bored.
Is it me, or is the universe wonderful near perfection (yes, I am here because I am loving the show), but the games just have this extreme hurdle, this extreme cost of effort to get INTO the game, in a different way for each installment, that prevent you from getting hooked into a full playthrough?
Maybe its just me. Was just wondering since the franchise is getting such a boost currently.
Having played them all a lot, I still feel the urge to go back every year or two.
What gets me over that hurdle I think you're describing is there's a goal I want to reach. A different way to do a quest, a DLC I've not played in a long time, a character build to try.
Given that the games are so open ended coming up with a reason why you're playing of your own matters.