It's a common side effect for both GabaPentin and Pregabalin. IIRC about 40% of patients on PreGabalin experience it. I would say the effect is stronger with PreGabalin. Seems like it can almost turn you into an emotionless blob.

So you to decide which is better, the therapeutic value or the decline/loss of libido and related things. For me it would probably be unbearable without it.