I'm a big fan of the series, but I have a different perspective here. I think Dexter's perceived weirdness (or lack thereof) in the original series is a matter of personal opinion, along with his attractiveness. He can come across as charming, but if you watch the series keeping in mind that he's lying to literally everyone around him and what he's showing to the world is a made up "normal" version of himself based on what Harry taught him, he seems a little less of an appealing nice guy Average Joe. Everything he says and does is calculated and manipulative to hide his true nature That's not exactly attractive and very much weird, imo.