Not to split hairs, but rangers do get evasion at level 8 or 9. Somewhere in that range. It's early enough to be very useful, assuming you build for DEX.
My heavy armor cleric sometimes gets evasion rolls for certain spells, namely some cold and negative energy spells. Not so much in the bloated world of epics, but at heroic levels for sure. I think everyone gets a "basic" evasion where they can save for half damage, but the actual feat allows you to completely ignore damage on a successful save, and you only take half damage on a failed save with improved evasion. I could be wrong. That's just how I remember it working.
It kinda negates some of the ongoing argument in the sense that everyone can evade to some degree, but only an extremely nimble, unencumbered hero can have the agility and catlike reflexes to limbo under a lightning bolt like Neo in The Matrix. It makes sense to me. I also think that a magical shield should be able to deflect the same lightning bolt, but i guess that's where MRR will come into play.