I was just thinking, reading a lot of these issues, yes some can't be solved by what I'm going to post, but I think quite a few of the simple ones can be and then people can stop blaming everything on this game or their team. They are obviously busy and the following are simple steps to troubleshoot the issue for yourself.
Remember, ALOT of people play this therefore there are TONS of computers out there, old, new, powerful, sluggish, gaming, media,& even just for e-mail computers. But when everyone wants to play a game, they have to remember not all computers will perform the same. Different driver sets, different hardware specs, its all a web of confusion for some. So check out my steps below and I hope I can help out a few;
1) Make sure your graphics drivers are updated to the newest. Some computers have 2 graphics cards, 1 on their mother board and one for games and graphic extensive stuff, make sure you update both. This may help mobs popping in and out, weird colors of graphics, and random glitches where you may fall through "cracks"
2) Make sure sound card drivers are updated, may also help with falling through things (yes I know it sounds weird but its happened to me in the past) as well as popping of sound and whatnot.
3) Make sure your windows or Mac system updates are 100 up to day as well, I am not a Mac guy, but for Windows, I know if you haven't updated for a while, you might be missing some key .NETframework files that the game may be using and why you can't log in or keep a stable connection. Make sure you have them all updates, the critical ones anyways, optional is up to you. I do them all except the bing bar.
4) Make sure shockwave and Java are both updates as well, you might not think they matter in the big scheme of things, but they still do play a part.
5) If you have ADDONs, and you've done the previous steps and your issues still not resolved, remove the ADDONs, don't just turn them off. In fact I am not sure why anyone would be using ADDONs on launch weekend when the game probably has its own issues first. Every time the game updates, which will be a lot through launch, depending on the updates, may require the addons to be updated as well and the people who make them aren't going to redo it 100 times during launch, therefore any issues, graphical or glitches could be because of the addons and the game files not cooperating properly. Remove them all then play, if your issue don't come back, put them back in 1 at a time until you figure out which one is your culprit. Addons can also cause weird graphic colors. Again, I highly recommend you don't use Addons until the community is more stable and the Addon creators more reputable (not saying some of you aren't) just saying for new people, be cautious when using them.
That's all I have at this time, before coming onto the forums raging out at someone to fix your issue, make sure you try to fix yourself first, then if the problem persists, contact support, at least then they will know you've done your best. It also takes the pressure off them for a bit since there is a million other things they are trying to take care of.
I hope I can help some of you, I know a lot of the issues with bank slots an missing items and quirky account issues, I can't do. But I figured i'd help some of you if I can, especially since I won't be getting my game until tomorrow thanks to Amazon.
But honestly, I have been playing since day one access and throughout the week, I haven't ran into 1 bug, glitch, issue. My only issue has come in the form of not getting my game in the mail. But I don't have any addon's and everything is updated.
Good luck everyone and hope to see you in game, look me up by this name if you wanna kill something

Take care!
TG
"Every man dies, not every man really lives." ~ William Wallace
Be sure to check out my ESO music Vid and enjoy, more to come;
https://youtube.com/watch?v=So1KVBx2IPQ