some time ago there was bad news about bitfinex it all made the user's confidence slightly decreased ..
If you're referring to the supposed hack they say they suffered from, then we're definitely not talking about people's confidence to have "slightly" dropped ~ nearly the entire community was pissed off, and rightfully so.
There are so many exchanges out there to trade at, but yet people choose to go with Bitfinex. I get it that they are the market leader in terms of USD trading, but does that really mean you should forget everything? Definitely not.
Them having paid people back doesn't change anything in that regard. People have been compensated based on the fiat value at the time of the 'hack', which is quite a bummer for all affected people.