ok so which one of these 3 does the best with the features i want
open world pvp
unique class system
crafting
fun end game raids
large game world
lots of weapons and armor to collect
fun pvp
I haven't played Allods before so I can't say anything about it. Both Runes of Magic and Perfect World can have open world pvp and both are decent. I enjoyed Runes of Magic's pvp a bit more though. PW has a pretty standard class system, but Runes of Magic allows you to combine up to two classes for one character. The crafting in both games is fairly decent with Runes of Magic having a bit more customization. I haven't played end game on either of the games. PvP in both games can be very fun.
Allods is the only one that has real raids more or less, in RoM and PW raids are laughable. PW is pvp based and RoM was just plain bad when i played it, lots of graphic glitches and massive class and cash shop imbalance but that was like 2 years ago, they might have fixed it but i doubt it. All of those have crafting and lots of gear and open world pvp. From best to worst i would say:
1. Allods - this game is most polished imo.
2. PW - when i played it few years ago pvp was very fun, pve not so much.
3. RoM - when i played it few years ago pvp was a total joke (no balance) and pve was lackluster, op cashshop.
Runes of Magic you can mix 3 classes now and has player housing and good quest tracking system open pvp realms but is dumb cuz high lvl just camp low lvls
{about 10 classes 2 races but can choose 3 classes tons of quest 0 grinding and fast lvling it has by far the most gear and weapon selection out of the 3}
Allods has ship (astral) combat and 2 factions = open world pvp vs opposite faction
{about 6 classes and 6 races all characters around your lvl will have same gear same weapon and look just like you lvling is slow after lvl 20}
PWI has flying mounts and HUGE playerbase open world pvp and guild battles and territory control as well as runs better on older computers
{about 8 classes and 6 races lvling is slow}
based on what your looking for I would suggest Runes of Magic