No, what I thought you were saying was that right as you are about to hit the back button the notification appears and you end up hitting the notification instead (cause you said you ended up in programs you didn't mean to so I was taking that as you inadvertantly hit the back button).
I did acknowledge that webOS's version does allow you to hit the back button before the notification disappears. I agree that is an advantage. But... for me I don't think that's a huge deal that I'd say that the new notifications are bad (just that they could be done even better).
Personally, I'm not sure I like them cause for me if I'm playing a game having the notification appear while I'm in mid game preventing me from hitting that part of the screen could cause me to "lose" (in games that require more quick reflexes like for example Prince of Persia). So, in that case, I agree with you (least WebOS would let you adjust but you'd still have access to controls though personally part of me almost thinks I'd prefer it to just pause my game like it does now but I know depending on my mood I find that annoying too

).
Honestly, everything has its good and bad points *shrug*. I don't think for pop up notifications I cared as much that they paused what I'm doing but I did care that they stacked and it was annoying to go through a list plus it was easy to miss notifications that way (and you couldn't go back and go to the other notifications, you had to pick which one w/out even knowing what the other ones were that you wanted to pay attention to). For me the biggest improvement was the notification center that allows me to go back and look at other ones I decided not to look at right away.