Gurochan > 4chan
Personally, I think the two biggest problems with 4 chan are
1) It takes the SA Problem and cranks it to 1000. The place is so ephemeral that it is a barrier to getting into it for more than the funny pictures. Also, like SA, the site is a haven for obnoxious teens that generally think they are much funnier than they are. This is fine to me, because the dash to 4chan means I don't have to deal with them as much elsewhere.
2) The image board system is just shit. At least give me more viewing options, other than Geocities 1996 Guest Book viewing format.
Yes, there's frequently amusing shit there, but it has a worse hit-to-miss ratio than SA, and it has readability issues. I'll just get my 4chan dose filtered by GAF and SA and here. Also I am not generally a fan of image macros, so I need to only see the best if I am going to see them at all.