I'm generally inclined to believe that this is a reasonably accurate description of the 1.0 rules. And they look
terrible. Not that I expected much different. Sounds like these are from before they started talking publicly about 5E, so hopefully there's been some feedback they're paying attention to.
A lot of it is a return to stuff from older editions that I was glad to see go away, but there's one new mechanic that I'm not thrilled by: the ability check system. So, if your ability score matches or exceeds the DC, you succeed automatically. But if it doesn't, you roll d20+ability mod vs that DC. Which means that with, say, an ability score of 16, you automatically succeed all they way up to DC 16, but at DC 17, success chance drops all the way down to 40%. But then DC 18 and up, it just drops 5% each time. That sounds incredibly wonky.
Also, at 20 ability score, the success rate for DC 21 is 25%. But, apparently, past 20 ability mod increases at one for one (I suspect that "20 cap" is just a starting stat cap). Which means that for every ability score past 20, the success rate for the DC one higher is always 25%, while the success rate for the equal DC (or less) is 100%. At least it doesn't devolve to the point of rolling never meaning anything, period (which would happen at ability score 31, if ability mods continued at 2 to 1 past 20), but it still feel incredibly bizarre to have such a stark drop-off from one single point of DC.
One thing I
am glad to see: no automatic level scaling of spells. That's a significant part of "quadratic wizards". Not all of it, though, and overall caster balance still seems to be awful.
I'm curious as to why those who are thinking "OMG THIS IS TERRIBLE!" have that opinion. Treat this as if it were a playtest. Instead of simply saying the whole thing is bad, say what you don't like and why. At the very least it'll mean a little more feedback for any WotC people who happen to browse this thread. Simply saying something is bad isn't very helpful.
Aside from a few things (some which I mentioned above), the bulk of it is just stuff brought back from older editions. Going into why I dislike all those various things they're bringing back would just be rehashing the same old "why I like 4E" arguments. There's basically nothing I saw that made me think "oh, that's an improvement over 4E".