Yeah really bad right now, every month the difficulty is rising 50%. March will probably be worse. Wait for difficulty to level off before getting into mining.
If you're interested in Bitcoins, you would do better by playing the rise and falls in BTC price on an exchange. I'll probably never mine my 8.8BTC back even though I have 700GH mining right now, I wish I'd left the BTC in my wallet.
If I could go back in a time machine to Nov 19th 2013, and tell myself this, I probably wouldn't believe it though!