I'm with thetearjerker on that, you can always move your characters to US server or oceanic. I personally think that if you are thinking latency would be a problem during raids, well most of time it is stable around 200-300 on a us server with a VIP20 unifi package that you already have. In fact ppl in the US too have a latency of 100-200. so it's not really something that's far behind for us.

For me, I do think that being able to communicate with ppl around me is more important than doiing high DPS. DPS of course is important, but lets say if you go for an LFR/LFD or Scenario or a pug group (with majority of strangers), but not able to understand ppl around you on what to do, that would suck a lot and ppl would hate you for not being able to understand what to do wand when to do it. Unless you already know what to do and thats a different thing. And considering that ppl are now in ToT raids, you have a whole lot of catching up to do. The new raids are very hard with a whole lot of different mechanics for each boss, that some of the bosses got nerfed more than twice. So communication is the key as sometimes different group has different ways of doing things.

For your third question, whether ppl would accept a vanilla player who stopped at WoTLK, i have no doubt that ppl would take you in, you just need to do some leveling and rep grinding thats all.. other than that you are good to go.

well good luck and happy testing, and I'm sure our malaysian guilds in the oceanic and US servers would be more than welcome to have you join them

yo tearjerker, give me time, i might make an alt on gundrak