Alright i did find a lot of instant pvp wotlk servers i.e. wowlegacy, rtk-gaming, mystery-project, euro-wow and so on....
Some of them are mangos/trinitycore based but have low population unfortunately and some of them use aspire/hearthstone which delivers just such a crappy bugged gameplay i.e. wowlegacy....
After testing a lot of servers, more than mentioned here, i did find two servers which are really great and on of them is probably the best instant server right now for wotlk. At least i could not find any other good populated on with almost bugfree gameplay.
[URL="http://warlegen-projocet.com/"]
Another server i did find which has similiar good instant pvp is :
Mystery-Project.com
* Trinitycore based
* All classes work almost fully
* Playerbase unfortunately quiete low under 50 ppl
* world not open for raids
* First server with vehicle combat !
I did really look much but i could not find any good populated english server with such bugfree gameplay like mangos/trinitycore offers, except the european server.
If you know any mangos/triniycore server with at least some houndres of players online, let me know....
I can only recommand warlegend-project.com and just say stay away from wowlegacy and servers which run asprire/ascent based emulations, the gameplay is just terrible bugged in comparison to mangos/trinitycore servers.
Hope I could help some people here to find a really jewel when it comes to instant pvp gameplay.
CYA