I just hate it when they give a bunch of weak enemys ALOT of HP so its not really hard to beat them... it just takes FOREVER
This.
The problem with being a bullet sponge is that it's tedious. The reason deathclaws are so popular and are referred to as being incredibly dangerous isn't so much because of their defense, but their offense. A deathclaw can still be oneshot and it can still be killed before it reaches you, it's just that when one DOES reach you (which their speed allows for) then you better act quickly or you're dead. A deathclaw challenges you to stay on your toes; a bullet sponge bores you to death and tests your patience.
I played Fallout 3 recently and when Super Mutant Overlords started spawning, they were ridiculous. Yes, they hurt like hell, so they were dangerous, but this meant that my tactic ALWAYS involved shooting away their gun first to make sure they didn't deal immense damage. Still, it'd take me like 2 minutes just to take down this stupid thing as it tried to punch me.
Luckily I don't think Fallout New Vegas has any real bullet sponges. With weapons like the Brush Gun and the Anti-Material Rifle, and all the high DPS ones, it's not hard to take down anything in particular.