I'm not a fan of the ugly faces, terrible posture and flexible limbs style. It doesn't look realistic and just makes everything look grimy. The characters look like they're all 40, degenerated after smoking 2-packs of cigarettes everyday for the last 30 years.
The scene with Smile visiting the Ping Pong store, I thought he was supposed to be the older brother of Peco or something and was confused as fuck at the conversation with the old woman. I only realized he was the same guy when he told Peco to come to school >_>
I realize, after seeing the reactions here, that some people appreciate the look but I really don't.
Then there's really no conversation to be had.
It's alright man. Art, art styles and animation is all subjective. One mans trash is another mans treasure.
People here always make fun of Psycho-Pass, Clannad and Angel Beats art all the time but that's their opinion and taste. At that point there really isn't any conversation to be had. Just like if we were to say that we don't like the style employed in Ping Pong. No one can really attack us for that. Some styles and animation just don't work with everyone.
The real sign of a person willing to see the good in something is to look past what one may see as faults and really find what others like about it. I am going to guess people like Ping Pong for more than just it's art style. Otherwise this really is just a shallow debate.
For instance, I hated Baka & Test's art style at first and didn't watch the show because of it. After getting past my own preconceived notions on the show I ended up loving the show. I've meet many people who didn't want to watch Death Note, Clannad and multiple other shows because of art. True you may not enjoy the show as much as others because of the art but that would be a pretty shallow reason to hate the show.
Personally I don't like Ping Pong for several reasons beyond its art style. I personally don't like sports anime. First episode did a bad job at drawing me in. I didn't care a lot about the characters and yes I didn't particularly love the art. Art is just one facet to an anime. If people drop an anime for one thing it does wrong then they are shallow.