I've never seen someone saying XSPEC is scam and also bring a logical argument; keep in mind sometimes the most vocal users are also the least knowledgeable, some these people bought at ATH hoping for a quick buck and panicked when the price dropped so now they're venting out.
XSPEC with the existing tech is already one of the best privacy coins, if they keep their promise and develop the project further with new stuff it will be a powerhouse for privacy coins for sure, for now price will stay low because the coin is not listed on big exchanges yet, that does not make the coin bad, it just needs time to get listed on other exchanges and for more people to know about it - it's still a new project in this ocean of cryptocoins.