I added some btc to Bitfinex but then I heard that it was hacked recently.
Is this exchange still trusted? What are your thoughts?
Well if you are doubt on bitfinex because of hacking issue, more better don't use their service and personality i am believe on them because they have fixed the bugs on their service.
somehow i am agree with densuj said and there is many good exchangers you can trade with like kraken, bitstamp, btc-e or else, but i think kraken is a good option for you. as long as you don't use all of your bitcoin in one exchanger then you are fine to go with trading, so you can trade with many exchanges.
btc-e is one of the oldest exchanges and is trusted
but it is not better than others such as kraken. the only thing good about btc-e (in my opinion) is the fact that they are not asking for verification and also they have many different methods of fiat deposit/withdrawal that can be helpful to people in many different countries that can not or do not want to let their bank know they used a bitcoin exchange.
I disagree with your statement. BTCe is in some ways better than Kraken. It is run and operated in the way of how Bitcoin services should be. It operates outside of any legal boundaries and anyone using the exchange is assured that no government department will come sniffing for their users information.
So you think Bitcoin exchanges are more protected because they are more legitimate just because they adhere to some laws? Then look at what happened to Bitfinex and Bitstamp. They were hacked for a combined amount of more than $10M stolen. Did the government help get back the stolen coins?
actually it doesn't operate outside of any kind of legal boundaries, it is based in Russia and it will abide by Russian law and if they need to they will come sniffing for their users information and nothing can stop them.
and no following the law doesn't mean government is insuring anything about the exchanges. it only means they are following the law

and when i say kraken is better than btc-e, it is just my opinion and i am not comparing then based on security or insurance, but mostly based on the type of service they are offering and how they handle their site.