I'm part way through Act 2, and the main missions have been really boring so far.
They feel like side missions with cutscenes.
Sneak into this place, hack this thing. Sneak into this other place, hack this thing, and then chase this person.
C'mon, Watch Dogs, let me do something different.
In the first couple of hours of main story quests, you get to:
Infiltrate a building either riding the cameras, physically stealthing, or blasting your way in.
You get to hunt down a signal, access the data point, then silently escape from the fixers who decend on you or fight your way out.
You're asked to pick up a fixer in need, and evade police roadblocks to get him to saftey.
The game is pretty varied, and within each encounter there are various ways to complete them.
I'm up to Act 2, I think about half way through, and so far the main missiosn have felt well paced and varied.