I'm totally new to this and was wondering if blockchain.info is secure enough. Can I get some opinions on the subject?
Secure enough for what?
I probably wouldn't store hundreds of thousands of dollars worth of bitcoin there, but I'd have no problem storing a few hundred dollars worth.
If your computer gets hacked (or you unknowingly download and install a trojan program or virus), it is possible that the malicious program running on your computer could capture your login information and pass it on to someone that could then steal your bitcoin. It might also be possible for someone to hack the website and feed you a bad copy of the webpage, and as such capture your password.
In general though, assuming your PC is clean and the website hasn't been hacked/modified, it is impossible for anyone working for blockchain.info to steal your bitcoins for their own use unless you provide them with your password or private keys. As long as you have a copy of your wallet sent to you on a regular basis, you should still be able to recover your bitcoins if blockchain.info were to suddenly disappear.