Bland, repetitive gameplay made worse by mandatory interruptions
The only things that take anything that resembles skill are PvP (virtually non-existent on f2p) and bosses (none on f2p). In addition, the combat is absurdly random: even with 99 atk/str and the best equipment, you can still hit 0 on a lv2 gnome/rat/etc.
Many skills are completely unimaginative, like slaying which requires you to kill x number of monsters for exp, and offer little in way of rewards.
Take it from me, avoid this game.