what do you guys think of en passant

what do you guys think about that rule?

is it fair

it's just another thing to consider.

yes, wikipedia en passant to see where it's from and why it makes sense.

Per SimonMcNamaraMTL the italicized rationale  pretty much says it all:

This rule was added in the 15th century when the rule giving pawns the option of initially moving two squares was introduced. It prevents a pawn from using the two-square advance to pass an adjacent enemy pawn without the risk of being captured.

SOURCE: https://en.wikipedia.org/wiki/En_passant 

I love it at the level I play because not everyone knows how to use it, or assumes I don't and makes horrible assumptions about pawn advancements at times that lose them the game

That's like asking if pawns taking diagonally is fair. It is what it is.