Pirated it, it's actually great fun.
It's a silly action game with all the grit of the original titles completely washed out, but it's still solid enough to stand on its own merits.
The main problem with Fallout 3 was how anemic every element of the gameplay was, but Fallout 4 seems to be the point where Bethesda has decided to take the series in a truly new direction instead of the bizarre, awkward fusion of RPG and FPS that FO3 and NV ended up as.
The combat feels good, when you hit people they generally react realistically.
Guns have a lot of punch to them, melee weapons cause pain and staggering to enemies, and so on.
The crafting elements are streamlined and enjoyable to use, it's a clever way to stretch out gameplay by making the random junk everywhere genuinely useful in the form of small but significant weapon upgrades.
The SPECIAL system is now just a perk tree that works similarly to Shadowrun's skill upgrade system - you put points in the stats for both perks and bonuses in the skills governed by that stat.
There's been an IMMENSE improvement in the animation department. They're still not going to win any industry awards, but everything in the game looks significantly more fluid and natural than even Skyrim.
Same goes for general graphical effects, they've almost caught up to current gen now.
In short, it's surprisingly an enjoyable open-world shooter, and it's more fleshed out than you'd expect from previous titles.
It's not perfect by any stretch, but I was expecting to hate it and I was pleasantly surprised. Bethesda still isn't seeing a cent of my money, though.