I managed to play from launch yesterday for 12 hours, I managed to get to level 45 on one class, and 30 on another and I was probably disconnected...twice during that time? The download and install were both smooth, apart from the insane amount of lag in the lobby, overall my own experience has been fine.
This doesn't mean that I don't agree with my fellow PC players in that there should have been extra ships introduced for launch, there absolutely should have been, and I am sure in time we will get them. I chose Ship 03 as I thought that one would be the safest, as JP vets will have defaulted to Ship 02, around 11pm GMT+1 last night, all blocks in Ship 03 were full, and this is the only time I experienced the disconnects.
I will be waiting with bated breath to see how SEGA and Microsoft do rectify the issues, it is a little concerning that we have had very little communication since launch, but I think it is safe to assume that it is because they are busy fixing the issues everyone is having, and are spending their time on actually working, rather than tweeting and replying to every thread here in the forums.
Fingers crossed my fellow ARKs, there is hope yet!