Crota is doable without warlocks and without hunters too. I have killed him on my titan a few times. Eleive me, I enjoy all three character types, all of mine are level 32. Don't put me in a nutshell with "your basically saying" because I'm not. Titans whether its striker or defender are great! My personal favorite. Helm of saint-14 is the best defender helm, and striker helm insurmountable skullfort heals you. I think warlocks are slow and rely on supers alone, and hunters are squishy. But I enjoy all three types.