Clone Wars' biggest issue, to me, was it was a very short window... Another reason the PT itself was flawed. The Clone Wars should've been longer than 3 years IMO.
I don't think it's a Clone Wars hatred on anyone's part... I loved the toon, though it sucked a lot more in the last 2 seasons than the earlier years. I think it lost its way a little bit.
This new era has a lot going for it...
A) It's largely unexplored turf... There are some small stories but nothing epic or expansive... Clone Wars had material already and that too could be viewed as a bit of a flaw. Its rampant stomping all over things was not good.
This era though, it's got a LOT of room for creativity without offending people. I think the biggest fear(s) are if OWK and Yoda get whored out in it too much... At all may be too much for some. I'd rather not see much on Yoda save for maybe a one-off of him landing on Dagobah or something. OWK, I guess I could handle seeing him on Tatooine doing something, but I really don't want to see him doing anything else or either one leaving their respective exiled planet.
B ) There is obviously a lot more OT tie-in available... One would have to assume Leia, Mothma, Tarkin, Dodonna, some of the Rebel Pilots, Antilles, Vader etc. are going to turn up in this series. And that's not getting into Jabba, Boba Fett, and their ilk. I think you'll have a distinct ability to sneak in even Ahsoka or other surviving Jedi getting hunted, and Stormtroopers, AT-AT's, TIE Fighters, Y-Wings... The OT goodness is just very likely to flow. You have a lot of things adults AND kids will like... I think that can only be good for it.
I think kids will react positively because it's a Star Wars toon... One with the Disney push behind it. I think adults will react more positively to an sorta-OT toon than Clone Wars. From the day the movie came out I remember adult complaints being rampant on TCW... Some justified, but I think many of the older crowd felt it was an even more juvenile version of the PT which was already viewed as dumbed down Star Wars. It won't hurt to have a much broader appeal is what I'm saying.
C) And of course, toys toys toys... A new toon is a new cash cow, potentially. A new era, if it takes off. Something earlier than the newest movie too, which is a year later. I think that might be a nice bridge... Right now the toy line looks to be sort of slow even into 2014, so this could be a major help in that regard, however the toys ultimately look.
That said, I still say separation of lines was a flaw in 2008, and that's about when the main line started to decline... TCW rose and fell with the cartoon too, it seemed, so I think less separation (stylized vs. realistic) is a major issue... Since adults largely didn't seem to support the stylized figures, and treated them as a wholely separate line of toys, I think it makes sense to not do that alienation to yourself. Will kids not buy because they don't look exactly like the toon (tough to say what this toon will look like even) they're watching? That's debatable. Hasbro didn't think so in 2008 when their Legends figures were all realistic "supporting" characters to the line that didn't have an animated looking figure. So I lean to a realistic look as being the safer, more logical way to go to keep the majority happy and interested.