Thms are in fact beastly, but another thing to note is you have none of your real DD skills, and on enemies with low HP and fights that don't last more then a minute, Thm will clearly dominate. However once you get to 50, and add in Lnc/Acr abilities, suddenly you start doing a lot more damage, compete with Thm, and over a long fight where MP becomes an issue for them, while you have Sucker Punch, you can at least tie, if not out damage them if played right.