I dont know where I would have to start:
I dont trust their code.
I dont trust them.
I dont like their inflexible model.
I dont like the amount of scammers they attract.
I dont like that accounts there are so anonymous, so scammers can loan themself btc, repay on time and get reputation
...
I'm in no way related to BTCJam and you are free to like or dislike anything you want, but your comment doesn't sound very rational.
You had access to their source code? Do you have any reasonable reason to not trust them? Anonymous accounts can't rate others, I had to verify myself in order to make a loan listing.
I found their system very useful and the site works pretty well. It's saddening how people is so negative around here.