These threads all boil down to the same: "I keep getting killed by [class I don't play] because of [ability I don't know how to counter], so nerf it!" Want to know how to beat a Titan? Play as one. Learn the weaknesses and limitations. When all you see is the receiving end of some ability you'll never understand what he had to do to pull it off. Also, a warlock's nova bomb will destroy a Titan bubble and kill everyone inside it. There are counters for everything.