There's a technique called 'Walking the Dog' with Flusterstorm. Also if you put your opponent on 2 good spells in lets say a 7 card opener and you feel you have a slow start it may be correct to counter (Force let's say) Lotus. Especially if you know what your opponent is on. Mana Crypt is sometimes a similar decision, especially against Shops or formerly Eldrazi. The decision gets easier with more information, and even easier if you are playing blue and have 4-6 textless cards to pitch like Skillstep and Flusterstorm.
But even against a blue deck who has Lotus, Mentor, any Blue Land, some mess of Flusters and Skillsteps. With perfect information you would Force lotus.