Pros
Pros is that many many smart folks with many years of industry experience come and go like its a drive-thru. A few old-timers start back-biting and squabbling almost immediately and this only coalesces the new comers into making a great network. Oh yeah, if you are hired as a senior staff, the juniors and admins will drop everything they are doing - eating lunch, working etc - and go fetch you water or grab your roller bag to your cube. Now, you see why I call this a 3rd world environment. I have worked in Asia, Europe and USA for many years and many industries and never seen any feudal structure like this. I saw this type of behavior quite a few times.
Cons
Too many moving parts and nobody tells you what is going on. Lack of moral values, decency, just a lot of hiring, firing and lies - every week you see new faces and every week you hear from grapevine that this or that person is let go - its never handle in a graceful manner, let alone communicated. There is almost no training other than you get thrown into the water so you either learn to swim or sink. Most folks will sink because they are set for failure and not fur success. There is absolutely no visibility into project pipeline or your performance. The so called Sr. staffs do informal evaluation and most of them include likes/dislikes of personal traits and nothing work-related or constructive. They will tell you that you are doing great, your job is safe, only the other person is going to get fired next Friday and then your turn comes the following week and you are told there is no more money left and then you see a few advertisements by A2Q2 in craigslist for your role and how great the company and mangers are. Before I forget.. they usually fire you just a few days shy of your 3 months so you are left ineligible to even file for unemployment.