After seeing an episode, I have to say, I really liked it, but there were a couple things that seemed lacking.
Now, I'm alright that the only voice actors they brought back were Frank Welker and Greg Berg... Wally Wingert does a pretty good Jon (though he lacks Thom Huge's BOOMING shouts and screams... something integral to Jon), and I kinda like the direction they took Nermal... at least you can tell he's a boy now.
But what it comes down to is that it really feels like a dub, a well written one, but a dub (whihc is the case, as it's a French cartoon). Mark Evanier ONLY writes the English dialogue, not the scenarios (which really took a hit on the wacky factor that Mark's solo writing of both that made Garfield and Friends amazing). And a lot of key running gags (so far that I know of) are missing. There's no attempt at breaking the fourth wall (something that was absolutely routine, characters griping about their lousy part in the episode, begging Garfield for more screen time is missed here). And I really am disappointed they didn't try to get Binky the Clown somewhere in the series. I can let the entire US Acres farm go (I don't know who would be a suitable Wade, anyway. Tom Kenny or Billy West seem like they could do a serviceable job, but without Howard Morris, it wouldn't be the same).
Plus, it seems like they redid old scenarios from the old series... one where Garfield is mistaken for a Sabre-tooth Tiger and one where Jon gets locked out of the house, and Garfield's paranoia keeps him locked out (replacing a horror movie with a news report). Not that that was a bad thing, since the old series used a LOT of the same scenarios over and over (especially later on in the series).
So overall, I really DO like it, and I'd buy a DVD if it was released in a season/series set (I HATE kiddy volumes), and I'd watch it as much as I could if I had cable. But it really seems like it's trying to be its own show AND Garfield and Friends at the same time.