Blown away? That might be overstating it a bit, but I expect a solid experience nonetheless. I try not to spoil it too much, I'm avoiding the trailers, so I may be more pleasantly surprised than some. I hate it when they show too much, be it games or movies..
Sony has a track record that only haters are willing to go against, so there's no reason to expect an inferior product. Of course, the devs haven't earned their medals yet on this front and Sony as the overseer can only do so much, but I think the long development time means that the project has been doing its rounds properly.
It might not be another TLOU or GOW, but I'm confident it will be a good game.