I like bloody mess- because of the animation and the extra 5% damage. But I would agree that the animations from Fallout 2 are better, more original and much more hilarious, sometimes sprites even beat shiny new gfx i guess...
yeah! the problem with FO3 death animations is the awkward physics and ragdoll movements. Don't get me wrong, on some occasions hilarity ensues and a satisfying death is watched by me old eyes. But... for example, the other day I crushed a radscorpion with a sledge... the thing is the killing blow descended upon it (in VATS) from above. So the poor creature received a force crushing it downwards and yet, for some strange reason, it flew not only backwards (like 10 yards!) but also slightly upwards! It was pretty cool for it ended up crashing against some trees, but the non-sequitur motion sucked! The other most common problem is when you blow legs off, damn! The bodies just fall so wrong! Even doing some weird spins and falling on their head!
Also FO3 deaths are just overdone... too much exploding limbs and heads...