Several reasons for not loving Google Chrome and Opera.
Too often, Chrome and Opera have a hard time to find a (new, uncached) site when you ask those browsers to go there. The connection is either slow or won't succeed. Trying a second time often resolves the problem, but why would we need two efforts?
There's often heavy flicker on page transition with Chrome.
Simply pressing F5 won't always clear the cache with Chrome.
Opera has a tendency to produce flicker with Flash.
Parent.scrollTop from within an iframe makes Chrome feel uneasy. The parent window moves to a negative top position.
I created workarounds to resolve these issues, but that doesn't provide an excuse for bad behavior on the part of Chrome and Opera.
Many ugly things have been said about IE, and rightly so, but it seems that IE9 must be preferred now to Chrome and Opera (if we ignore IE safety vulnerabilities).
And FF is by far the best. It may sometimes load pages slowly, but it DOES load them, always!