That's funny, I was just checking out the (wave 1) Garfield figures yesterday morning to decide on starting another new line.
Edit: Okay, now that I've checked him out, John does look to have the mumps. You can tell who he is without the name and it is close, but... We'll have to wait and see if this is addressed. Perhaps in actuality it won't be as off as in the pics--seen this way too many times to depend solely on 2D pics.
If the only difference between the Garfield figures themselves is his expressions, they should just make a faceplate kit. I wouldn't buy a 2nd figure unless they had him in different outfits.
All that said, I like the price point (for regular figures) is staying where it is for now.