I actually like Safari best, except that it crashes constantly. Perhaps it's a problem with my MacBook but I am constantly getting the "Safari encountered a problem and had to close" errors, after it crashes and loses whatever tabs I had open.
Other times, when trying to move from one page to another, I get the whirligig thing forever, as if it's having trouble bring the page up (although I can usually navigate to the same page with no trouble on my PC), until I finally have to give up on it. Then, it won't let me navigate to a page that it can handle, or even close out the browser, requiring me to force quit Safari.
When this happens, the computer isn't locked up, as I can open other applications. I once let Safari work on it for at least a half hour and it wouldn't give an unable to navigate error or find the page; rather it just kept working on it.
In fact, I can open Opera, Firefox or Camino, and they will navigate to the same page without problem.
I have had similar problems in iPhoto but I see it way too often in Safari, probably because most of my computer time is web-based.
I like the look and feel of Safari but seldom use it anymore because it's unreliable.