Spell hit - WoWWiki - Your guide to the World of Warcraft

The base miss chance versus any player target of the same level is 4%, however certain races have an increased 2% chance to be missed by certain spell schools (nature for Taurens/Night Elves, shadow for Draenei/Undead, arcane for Gnomes, frost for dwarves, and ALL spells for Blood Elves). For this reason, max hit can range from 4%-6% depending on what spells you intend to use. Also see spell penetration for increasing chance for spells to land or to land unresisted in PvP. Note that some classes (for example Paladins, Rogues and Druids) can spec to gain extra chance to have spells miss them, which CANNOT be mitigated by additional chance to hit. Also, some abilities (e.g. - Cloak of Shadows, and spell resistance for binary spells) give the player using the ability extra chance to have spells miss as well. Extra spell hit does in fact mitigate these spells' extra chance to miss, but is typically unnecessary.

4% base + 2% por racial (BElf todas las escuelas, las demas razas en cierta escuela) +2% por talent (Que segun esa info, estos ultimos 2% no pueden ser mitigados, osea siempre vas a tener ese 2% de missear)

6% seria lo ideal, osea 160 hit rating masomenos. Yo tengo 75 hit rating (2.83%) y 3 puntos en Suppression, pero obviamente, la pet missea, justamente el Spell Lock es de la escuela Arcane, un mago gnomo con mage armor (resistencias), tiene MUCHA chance de que le missees, ni hablar si tiene el talent del Blink... 25%+