WesternAnimation Terrible
This cartoon is absolute crap. The Rabbids are annoying and obnoxious, and the other characters are ugly to the point that it's hard to look at them. They constantly reuse the same backgrounds, ideas, and "jokes". They've already overused every unique idea they have, and they haven't even started the second season. Gotta give them credit, though. It's not often a show can overstay its welcome in one season. This crap is lazier than low-budget 80's cartoons, less coherent than a show for infants, less funny than a bad YouTube Poop, and more obnoxious than Breadwinners. Sanjay and Craig is good compared to this crap. At least that show doesn't rely on screaming for half of its failed jokes. Do yourself a favor and watch literally anything else on television.
WesternAnimation Not bad
I don't think the other reviewer did it justice with just talking crap about it, so I'm going to give my two cents.
I don't think it's bad. It's not perfect, but certainly not bad. And it definitely is not near Breadwinners and Sanjay and Craig in terms of being bad. In contrast, I think this show is pretty funny and creative. Sure there are Toilet Humor and they can be annoying as hell, but I think that a lot of the humor is geniune.
If you are able to look past the constantly re-used designs and other of what I mentioned above, the show itself is quite entertaining. The Rabbids, when not annoying, can occasionally display craftiness and be actually funny. Yes, they scream a lot, but hey, these are the Rabbids we are talking about; did you expect them to be mute?
I did expect the show to suck when I first watched it, but I found myself chuckling quite a bit. Don't get me wrong, there are episodes I despise, like when their only purpose is to be annoying to humans ("Until Rabbids Do You Part" and "Rabbid Radar" in particular"), so there are hit-and-missses, not unlike The Looney Tunes Show. However, when they succeed, they succeed hard, and it's usually when the Rabbids tend to themselves, their curiosity and accidently annoy humans.
Like I said, it's not perfect, but it's a good watch if you're bored and want to watch comedy which you don't have to put mind into enjoying. So before you go "Oh look, another CGI- sucky cartoon", look at the actual comedy first. It's not as bad as you think. However, if you never liked the Rabbids from the get-go, then maybe it's a better idea to avoid it.