The problem is generally Razer has awful build quality / durability across all their products =\
Anyway best of luck to your BW
I really think the experience can vary a lot. My old BlackWidow Ultimate has never missed a beat, and feels a little better made than my older Das Ultimate, although the keycaps are really crappy.
Having said that, my Razer Imperator mouse, while great when it works properly, sometimes gets all bugged up and one axis will stop responding intermittently.
I think that the BW Tournament edition is pretty well made at a decent enough price.
What I have to give at least some credit to Razer for, though, is that they actually made the BWU widely available so I could try out a mechanical board in person. Back when I started, this was important to me, as I could try MX Blue and MX Brown in person at my local BestBuy. Now, the computer stores stock even more types of mechanical boards, which is great, but I have to give a nod to the ones who were there early on.
I still use my BWU with MX Blue, despite also having many other boards, and I probably will continue to as it's not as bad as all that. I'm sure Razer quality can be bad on some product, and their marketing is certainly questionable, but I do think that it's the "in thing" to hate on Razer, if my experience is any indication.