I remember watching Kyle XY and the last episode just... ended with a big twist and that was that. Very, very confusing.

Details on the ending, spoilers for Kyle XY

If I remember correctly, the main character was chasing the villain and when he caught him the guy went "Wait, don't kill me! I'm your brother!" THE END.

So I'd rather have a resolution, good or bad, than something bizarre like this lol.