No it isn't and no it doesn't.
I am playing Vegas on Very hard with hardcoe Mode on, it has become a most interesting game for me, but FO3 was harder.
I find this to be the most baffling opinion/statement in this debate.
With much more skill points per level, skill books, bobble heads, invincible VATS, nerfed Death Claws, more powerful explosives, The Terrible Shotgun, Lincoln Repeater, Fat Man, Harkness' overpowered plasma rifle, that ridiculously powered special chinese Assault rifle, Dart guns to slow down the only remotely scary baddies (Reaver Goul), perks on EVERY LEVEL, overpowered Gass Rifle, that freaking Chinese Stealth suit (I refused to use it, just too easy), The almost perfect perk that gives you all 9 on Special, weightless ammo, instant healing stimpacks (which are way too plentiful), limb damage fixed by stimpacks, sleep fixing EVERYTHING...........
........I just can't conceive how ANYONE can find FO3 challenging. Not Saying NV is a particularly hard game but compared to FO3...........
I'll listen to "better exploration" but sorry, that one just has me at a loss.