Well, I'm no expert in p90's but to me the Duncan designed ones sound quite good, maybe the ones I played were an exception... maybe at the factory they put some real Duncans under the covers

maybe it was that particular guitar... go figure.
I even A/B-ed it with some hummbucker equiped Ephiphones in the same price range (SG/Les Paul) and the Squier was the better sounding, certainly the most brighter and sparkling.