ToD contributes very little in terms of DPS increase for its TP cost, similar to Fracture. It's not bad--just expensive.

For this reason, it's better to use it conservatively or when it outmodes any other option on the table. i.e.: losing optimal position due to mechanics or enmity shift. Dealing 280 potency on a GCD when you would only otherwise put out 140 on a missed MNK positional is a good deal, and it gives you time to get into the proper position for that combo.