Do you think Nexon made a mistake with vindictus?

Vindictus runs off of Half-life2's base files, the only thing Nexon did right so far as far as I can tell is hide the Keyboard options in the config menu. Otherwise everyone would go:

Options > Keyboard settings > Advanced > Enable developer's console

Esc, then ~.
SV_Cheats 1
npc_create npc_polarbear (or other npc bosses)
impulse 101
god 1

Those are server-sided variables. They will not work unless you try it on the server console window (or whoever is host if it's a listen server).

For example, you could pull up the console in Counter-Strike and do whatever (e.g. bind mouse1 die), but if you try to do something that's only for the server (sv_restart 1) that won't work.