I don't see how that is confusing.

Opera etc can render some pages really well, but then some pages, even though it doesn't render them 'correctly', look much better in IBrowse.

Ease of Switching

IE,Firefox and Opera have all settled on using this symbol for RSS feeds . Many websites also use the icon and it has become effectively a standard icon to indicate feeds. Safari for some bizzare reason have decided instead to use

In Firefox and IE (possibly Opera also) double-clicking on the tab-bar would open a new tab. This doesn't work in Safari.

Firefox2 and Opera9 both put the x to close a tab on the right-hand side of the tab. Internet Explorer7 and Firefox1 puts a single x on the far right of the screen. Safari on the other hand follows neither method preferring to put the x on the left-hand side of the tab. Those used to the FF2 method (like me) will probably end up closing the tab next to the one they want to a few times.
I don;t see what difference the RSS logo makes. Safari's is much more meaningful to people who don't have a clue what RSS is.

As for close buttons, that is just a minor thing. All web browsers would be the same if everything was in the same location on each one, which would defeat the point in there being more than one web browser avaliable.