IE9 still has some minor issues, but I use IE9 anyway.
I don't necissarily want to use IE9, personally I prefer IE8, but IE9 does have some features that are growing on me, mainly it's just about getting used to it. I aso use it because it's far better that I know the issues personally when some user comes to me with a problem... then I can identify it as an actual IE9 issue or an issue that's just being blammed on IE9.
Frankly as for IE8 Vs IE7? I went to IE7 from IE6 and though I never liked IE6 either, I disliked FF more, "Chrome" and the others simply weren't an issue at the time because they didn't exsist.
the first time I tried IE8 I developed an instant passionate hatred for IE7.
So on the typical five (XP or Vista) computers I run setup on in a given week the first thing I do after I get the computer to go online is to upgrade the browser from IE7 to IE8.
One of the things I dislike about IE9 is the way it handles downloading pictures.