Some help please <3 (WOTLK)

Hey, i used to play on molten then i stopped now i wanna come back again so i have a couple of questions.
1. How buggy are the wotlk realms? out of 10? compared to how it was before.
2. Which realm is better ragnaros or deathwing?
3. If i want to play lordaeron (When it comes out) do i have to download the client that says "wrath of the lich king (Old)" ?
4. what rates are the 2 realms?
5. are there many hackers as before?
6. is the community good / kind? lots of scammers?

Thanks for the help with any of the questions. really want to get back in some WoW!