I was thinking the same thing. Folks who casually diss The Clone Wars either haven't seen it all the way through or don't have a grasp on good Star Wars storytelling IMO.
'O' being operative...my diss is far from casual, having seen all of the clone wars material, including the original Tartakovsky series (which I loved), the movie (which bored me), all 6 seasons of the second series (which I find to be extremely variable in quality*) and the Lego features set in and around the CW period (which I found fun and silly), my 'O' is that the main Clone Wars stuff is overall just average in quality for SW as a whole(Tartakovsky excluded), but still better than the PT stuff in terms of plot and interest.
The look so far at fairly cliched characters (not a big deal in itself), kinda ugly Lego models of the ships, and this sneak peak have reduced my hopes that Rebels might be a step up. But if it can reach the level of the better CW material then maybe...maybe...
*Eg IMO creating a yellow Darth Maul, then reviving a bisected Darth Maul is really, really weak and lazy story telling, but the Assaj Ventriss plot arcs were far more interesting and creative. Similarly S6 Jar Jar plot line was inane whereas the Yoda + Younglings getting their lightsaber crystals added something to the SW universe.