I've not had many issues run my titan in crucible. Couple things could contribute to bad k/d are bad weapons (true I've seen people wreck with the starting auto but that's a select few) and bad connection. Try different weapons, i sucked at crucible until I got the last word. Since then I go positive more often than not and when I do go negative there's those couple of people with red bars which I don't think is coincidence. Keep trying different loadouts and see what works best for you.