Strike force missions

Have any of you tried the strike force missions out yet in the campaign. If so are you finding it ridiculously hard. It took me nearly 3 hours to complete the first one on veteran, all of the units they give you are completely useless unless you are actually playing as them. Just had 5 attempts at the Shipwreck and the first three none of my units would leave the spawn, and on the last two i ran out of time before i could destroy the third objective.
Also you have a limited number of strike force teams so if you fail quit the game

I didn't even bother with them.. The first one was just boring

i found them boaring, what happends if you dont do them?

im not totally sure managed to complete 4 out of 4 the last two were pretty easy compared to the others