Regnum Online has an easy archer stealth class called Hunter.
You can go into stealth mode and it also gives you "radar" to track your enemy, wait invisible until his grinding has brought him to low hp, then ZAP u kill him.
format is the same as Aika Online, but gfx is simpler and faster.
Regnum is totally f2p and is regarded as being balanced and not pay to win.
Compared to other games in this thread, regnum has probably lesser grind.
But..! It does have less gfx detail, tho it is very immersive (due to good sounds/music).