The harm for me is that Jar Jar's humor often comes at the expense of the movie. It's not just the scatological humor, that's just the lowest example. An example is the Battle of Naboo where Jar Jar's antics take a battle scene at the climax of the movie and turn it into a silly farce with no tension or stakes. Seeing him bumble around without getting shot makes the villains seem harmless and lame. This would be equivalent to C-3PO accidentally getting stuck in an X-Wing and flying around with Luke during the battle of Yavin, accidentally shooting down TIEs. The first two OT movies generally knew when to be funny and when to take situations more seriously, TPM feels sloppy by comparison. Also, aside from the Sarlacc burp which I never found funny, the others are natural reactions to the situations the characters were in and feel more natural. I haven't seen Jurassic Park in forever so I can't comment on that scene.