It's really not as bad as people portray. Most sites do work in Safari. There are some problems, but they've been pretty good about licking them over time. It's passable enough that I only have to punt to an alternate browser once in a while.
I've tried to use Firefox, I really have. But Firefox absolutely murders my battery and I'm sorry, but they need to do some serious usability improvements... especially around the container implementation and tab management. It's confusing as fuck (to me).