I'm not going to claim that
SL doesn't have technical problems, but at least for me, a much bigger issue are all those idiots and jerks who log in despite all the poor performance and breakage. Griefers, noobs rezzing penises, brazilian spammers ... you know what I'm talking about. A failed teleport will annoy me, but that's just a technical failure, nothing to get upset about.
People make me want to stab them.
Okay you can argue this is also a result of a bad LL decision to open registration, and it is. They should have fired the whole 'community' team along with Cory