I did love my DeathAdder, but that is one mouse out of their entire lineup. Plus it's not like it's hard to get headshot after headshot in a single player game. I could do that with a $15 Dynex mouse (no offense). I've used pretty much their whole host of products (mostly bought, some received from tournaments as freebies), but they seriously have the worst QC in the industry. For every bad Logitech product, there are a bunch of bad Razer ones.
It's not even like I hate Razer. I try to like them, especially since they're the only company who actively tries to cater to left-handed people, of which I am naturally (left-handed DeathAdder was my second love after the MX310, and now they're making a left-handed Naga). I've had to learn to use right-handed mice, and now I'm pretty ambidextrous, but it still feels more natural to use a mouse on my left hand.
But yes, I do try to like them. Otherwise, I wouldn't have spent over a grand on their products in the past 2 years. They have some great designs, especially with stuff like the Naga. But it's simply not worth having to replace their products ever few months despite treating it like a baby, while I could throw my Logitech at a wall and it'll still work perfectly.
And I agree about Logitech's drivers sucking (especially with their headsets), but Razer's moving in that direction. Cloud-based drivers are a horrible idea.