1. Yes, it is proven that binance has very good security and yesterday's incident I think is because there are people in the hacking
2. the average volume there is indeed very high
3. most of the IEOs conducted there have experienced more success than other exchanges because the community there is very large
You can say binance can be reliable in these aspects. If you want to invest in a project that is in their launchpad for IEO, its as good as binance had indorsed this project and cab highly be successful. Its also been hacked once and binance has an insurance policy for these incidents too. But for trusting KYC, it may not really be that easy to trust them.