Sorry, the play test is over D&D: Next doesn't exist, and won't likely look anything like the play test (at least according to the developers).
You've been asked to provide a source for this claim several times before, and you ignored those requests and go on to just repeat it. So, I am again calling BS on this claim. Put up or shut up. You get your opinion, but you don't get your own facts. You show me where any developer said or implied it will "not likely look anything like the playtest".
There is no arguing that 1E and 2E are better designed from monsters that are challenging, but not super deadly to dice rolls that make sense (ever been blinded, prone, and intoxicated in 5E? Yep you just have disadvantage once).
I am arguing it. Definitely, I am arguing it.
If you just want to see what the 5E play test was like, sure go play it, but you'll not be playing what will come out on shelves in summer 2014. That's just a fact.
Support your "fact" with evidence, or stop calling it a fact.
They will also run into all the problems I and others listed. That's also a fact.
It's really not. Like I said, I've been playtesting for over a year, and my experiences don't match yours at all. You seem quite fond of saying or implying your experiences are universal. It's myopic.
You will have character's die because a 1st level monster got a lucky shot in.
The death rules are very generous, and I doubt this. We've come close, but no party deaths so far, and the only time it was close is when the players did something stupid and took on something either too powerful for them, or when they were already too exhausted to do it.
Your players will slaughter just about any monster they come in contact with (short of the cheat feeling super bosses, if those made it into the last play test packet).
Wait you didn't even READ the last playtest package? So what the heck are you doing, commenting with authority on something you didn't even read?
Casters will dominate with spells (while never running out around 5th level or so).
This is hilarious, given others are complaining the casters were seriously nerfed in this edition.
They will destroy your carefully designed boss monsters with a single spell (something around a 20% save chance to make the save or die save on the monsters part). They will get mad when you use a creature with a save or die effect to take them out of the game with a single roll. These are all just facts you have to deal with.
Or rather, they are opinions he can ignore.
No point in playing the play test now...
Unless you want to, because you like it, like thousands of enjoyed it so far.