My main problem was with the attachement blowing up in-line, making it a huge mail while i was typing or reviewing the mail. I never heard of any recipient having trouble opening my attachements, so for me it was purely the cosmetic issue. That and other trivial things should 'just work' or at least been optional. That is where Apple is consistently missing the boat: making changes to UI they think are right, but which alot of people disagree with. The new layout of iCal is an example of that, and seeing as how much impact it has on managing the agenda (having to click on a tiny area to drag the event because it keeps hiding, unclear overview because of overlap etc) I call that a fiasco.
And you cannot compare it to Windows: for WIndows and Google gear i pay max half as for Apple gear, coupled with their boasting of 'it just works' I am expecting such trivial flaws not to exist or at least to be fixed asap.
Apple is doing neither (Lion has been out for more than half a year) and there are no signs Apple will actually fix this.
The only time Apple fixes something is when there is big media coverage about it, and this is almost exclusively the case with iOS issues such as the battery drain and antenna problems. It would suit Apple if they would at least try to fix the OSX issues, especially considering the price you pay for it and the fact that Apple software is designed not to be tampered with (for WIndows you can at least use 3rd party solutions, whereas Apple discourages that).
SO to summarize
-Premium price
-Just works slogans
-Constant trivial flaws
-Not even trying to fix it
-Designed not to be fixed myself
-Lack of optional settings for changes they make (for example, a semi-fix for the iCal issue is a setting which has to be turned on/off through Terminal) and impact the experience. Now I am stuck with the choices Apple makes, while it could be easily turned into a preference setting (the settings are often already present in Terminal, it is just lacking a preference button).