When (genuine) newbies come along and start asking for PayPal to BitCoin trades they are treated with suspicion because as we all know we should... Beware of PayPal and other reversible transfer services https://bitcointalksearch.org/topic/beware-of-paypal-and-other-reversible-transfer-services-14632 that being said if you really are a newbie and not just another multi user trying their luck with a quick scam, you'll get PM's from users with too good to be true offers.
Take the time to check their "trust" (click on the word over yonder <--- )
These ratings are from people who are not in your trust network. They may be totally inaccurate.
Show ratings.
Click on "Show ratings" these are what other people have said about the user - if the user has a negative score, then it's usually spite that's driven them to post.
If the comment is in red, but there is no link in the reference column, same thing, it's just spite with no proof.
Hope this is of some help.