Did you observe any changes in damage between the hotfix tuesday and patch 1.05a? Yes or no? Really simple question. Either answer is valid - seriously! (Some people have observed more damage after 1.05a, some haven't.)
No, none at all. I understand either answer is "valid," however, what most people who answer "yes" are experiencing is confirmation bias. So they logged on after the hotfix, had a couple tough elite pulls and said "wow, something must have changed." They then take to the forums, see this thread, and bam, the hivemind kicks in and confirmation bias takes over.
Below is a perfect example of this.
I noticed elemental damage was pretty rough on MP3 yesterday but I figured that was due to my Andariels' and I was in act 4 where there's plenty of fire damage. After seeing this thread it's making more sense.
I spent a fair amount of time after 1.05 launched figuring out what MP I could do. (About 1-2, my all resist is quite low.) After tuesday's hotfix, I played for a couple of hours, and cleared about 3/4 of Act III on MP4. I wouldn't call this "efficient" - I think I was marginal for MP4 at that point.
This wasn't really possible in my experience prior to that hotfix. That's neat and stuff, but I don't really care at this point, I am pretty tired of this game anyway. However, my character is pretty sensitive to elemental damage.
So when I saw this thread, I decided I'd try it out and see if I noticed any difference. I figured if this were a typical forum BS post, I wouldn't notice anything. On the other hand, if damage was worse, I assumed I'd notice it easily. Since I already knew my character was on the borderline for MP4, it seemed like a reasonable test.
Anyway, when I tried this last night, I died on 8/10 elite packs. (I nearly died twice on one pack, although it was a particularly tough set of affixes. I rolled one pack - literally didn't realize I was fighting an elite pack until I got to the last mob.) I got about 1/2 way through level 2 of the keeps when it became quite obvious that I wasn't cutting it on MP4.
During that time, I used about as many healing potions as I did during that level and a half run as I did through the run of 3/4's of Act III two nights prior. I also used strategically every health globe that dropped - also in marked contrast to the prior evening.
This was not an especially subtle difference, and I don't believe it was my imagination.