The thing that sets mabinogi apart from other MMOs isn't just it's combat. Even though for a LONG time it stopped being mainly a life game where EVERYTHING (And I mean EVERYTHING) could kill us in a few hits. It's got it's life element to it as well. Also, it's combat is different from other MMOs not in the fact that you have to load your skills (which doesn't make sense for anything besides alch and magic btw), it's the fact that every single action pushes you or the foe around. Other MMOs at best have a small amount of skills that can sometimes knock 1-a group of foes back from you and then they just run back to you and stand there attacking.
I have to admit the load time is not the only feature helping mabinogi to be unique. It's just that I wouldn't be able to list everything and it was one of the main points raised in this discussion.
For wm, 0.8 s of load time might be overpowered but when I started playing mabi NA (I'm living in Europe and had to use a proxy in the early days), it was needed to compensate the lag, so I wouldn't complain about it. I guess wm was supposed to be a last resort skill to save your life in multi aggro situations but it ended up being the best offensive skill for melee. They probably made it difficult to train to limit the number of players with r1 wm but it didn't help once everyone knew it was the first thing to rank up.
It might have discouraged some casual players from optimizing their fighting skills tough. Fortunately you can do life skills for fun without "needing" to fight high level mobs.
Now on a last note, just imagine melee without wm, we would be fu**** up. At least all the other fighting styles are ranged and can naturally pull out mobs (well melee can too but it's boring one on one) or use AoE skills from afar.