4 attacks with a dragon slayer sword, 360 degree charge arc, and immune to psychology? That seems like a pretty legit monster hunter. Pricey though, and a little squishy.
We've been over this in a different thread, and the concensus was that it's garbage: Looks good on paper initially but once you do the math you realize how ineffective it is.
Against truly scary monsters where you really need it to work (read: ridden monsters), you'll most likely hit on 4+, so 2 hits, then 33% chance of getting a 6, and they have a ward ontop, so best case scenario, you have a ~15% of it working, and the remaining 85% you're just throwing a pretty expensive character to his death (most ridden monsters will beat him to a pulp).
He's alright at hunting less dangerous monsters where he hits on 3+ and where he might even survive a retaliation and get to swing again, but overall in an allcommers list, he's more often than not a waste of points, especially given how useless he is against everything else.
TLDR: Pick Ogre Blade instead, almost as good at killing monsters but vastly better against everything else.
Edit: Personally I think Dragon Slayer Sword needs regular Killing Bow as well, it's just so bad at 50 pts. It is too specialized for it's own good and it doesn't make sense that something that can oneshot a dragon can't oneshot a goblin bigboss.