No, because escort missions are frustrating and tedious.
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Not if they're done right. Saving the pilots before calling in the Airstrike in Seoul (Splinter Cell: Chaos Theory) was awesome. First, you had to worry about the chaingun mounted on the tank, as well as the baddies walking around, and the flickering light you couldn't put out that put you right in their sights when it came back up. Also, the chatter between Fisher and Lambert while you were doing it was awesome. Lambert was pissed off because he was worried you'd get killed saving the knocked out pilots, and Fisher was being his usual hardass self.
Lambert: Nobody even knows you exist, you won't be getting any medals.
Fisher: Medals don't help me sleep at night.
It was entertaining, like listening to Lambert call Fisher a hippie while he was on the train.