My mtgox account was hacked which a total 80 bitcoins been stolen.
account security background:
mtgox: not set OTP, bound my gmail, no account verification (It means my account can not do any withdraw, because I intend to hold long-term, is not prepared to trade)
gmail: not set OTP, same password with mtgox

November 19 when i login i found an exception information (I never apply for verification, but the system says my application are being audited), I realized account been invasion, then i change the password immediately (but forgot to change gmail password), send mail to customer service, issue a warning.

Shortly my gmail been hacked and i can not login, the hacker use the "forgot password" function to control my mtgox account.
then I use other mailbox send mails to mtgox and submit a request on "mtgox support ".remind the customer service to freeze accounts,.
on the other hand I also submitted a complaint to Google .want to get back my gmail

Nov 22 I received mtgoxs response saying that they have banned withdraw ,asks me get back my gmail first .

Gene, Nov 22 17:04 (JST):
Dear Valued Customer,

Sorry for the inconvenience.We have merged your tickets for better follow up.We have set your withdrawal limits to zero to avoid unauthorized withdrawals .We request you to change your email address password and Mt.Gox password immediately. Please do not use the same username and password on different services.Let us know once you recover the Gmail password

November 23 reply to me also say money is safe:

Gene, Nov 23 12:25 (JST):
Dear Tan ,

We have disabled the withdrawal and the funds are safe.We request you to do a follow up via one email for a better follow up. As you have a request open from a different email Request #148228we are closing this ticket and please reply via Request #148228 as provided.

In the meantime, I send e-mail to tell mtgox I'm with Google Contacts, you must ensure the safety of funds
Dec 3 to receive such messages

Gene, Dec 03 16:44 (JST):
Dear Tan,

Thank you for your reply.On checking I find your account has been flagged for further confirmation by our assessment department. I will have your issue forwarded to our assessment department.

Then I kept asking "forwarded to assessment department" What does that mean？ what should I do,
but there is no any response.

Dec 9, finally got back my gmail.
then i send many many mails to mtgox(also update the "request" on "SUPPORT"). tell them my gmail back and ask what should i do next?
But the whole eleven days,no one reply me anything.
Until Dec 20,they tell me all my bitcoins been stolen

Gene, Dec 20 12:44:
Dear tan,

On checking we find BTC withdrawals has been processed within the account.We will investigate further on this and will keep you posted.

I know the main reason is my little low-level security measures, but this event mtgox equally important responsibility.
There are three aspects of responsibility
1. Reply is not timely, a reply even need eleven days (12.9-12.20)! Wasted the best time to stop the thief.
2. I have already warned account been hacked, ask to freeze the accounts and prohibit financial flows, they said no problem at the beginning , but they make my money was stolen finally .
3. Accept the false documents submitted by the hacker, and passed the verification application, allowing hackers to successfully take money.
Before I had been more optimistic, because I have warned the customer first, second my account has not been verification, I think that hackers can not withdraw my money.
For the above reasons, especially 2&3, ask for advise, can I sue mtgox?