Well for me who has played marauder, merc and now assasin.
the marauder is by FAR the most under powerd of the three.
Assasins do large amount of dmg and can cloak AT ANY Time.
While my merc is a decent healer with heavy armor that atleast can take some sort of dmg,
but as for marauder that has medium armor and is meele, most of the time u die before u get a shot of, unless a healer can keep one alive for more than 3 seconds ( and my marauder has by far the best gear of my three chars, almost all pvp gear and everything in purple )
that's my 2 cents atleast.