I don't think people "really rate" 452's, they do however think they're an excellent tyre for the money. I doubt anyone believes they're as good as MPSSs, AD08s or even the standard RE050s, but for the money they're a good tyre.
Indeed, I mean I run them, but as I don't really track the Zed and it's my daily driver, the midrange 452's work well for me.
Did take the Zed to the Ring in the summer and I did loose traction at some corners after having gone two laps already.
I guess this is where the premium or track tyres come into their own, since they are designed for purpose.
I'd also like to add that the 452's were rubbish in the winter for me, hence me switching to winter rubber in the colder months