ok, so i have seen some items that increase your skill in stealth by1 so if i have 4 out of 5 points in that talent, ill have 5
but if i already have 5 points, does the new one stack and becomes 6/5?
hope you understand xD
(the talent is master of decepcion)
It works a bit different as i remember back to old days.
There are some values which are hidden under those tooltips.
Examples:
each character level = 5 pts of stealth effectiveness
MoD each point (talent) = 3 pts of stealth effectiveness
so MoD 5/5 = +3 lvls for you
some enchants and effects on items were usually 5 pts as i remember
same for shadowmeld
perception (humans) gives +20 pts to detection
Basically, if you're a night elf subtlety rogue with stealth boots and cloak enchant, you are at the equivalent of being 6 levels higher than your opponent, making you practically invisible to a same-level player without Perception (human racial - +50 points) or Track Hidden (hunter tracking - +30 points).
Investing in stealth detection (through Heightened Senses, engineering goggles, and alchemy elixirs) is also important because, logically, other rogues and druids will do the same and you have to keep up in the arms race.
I could go on a lengthy discussion about the advantages each race has, but that's a different topic.