Gotta say the engineer, love their new shotgun and det packs can be alot of fun. Plus they can slice into vehicles. Plus health and ammo packs make them a useful addition to your team, I pass tons of those things out too allies every game.
The only thing I dislike about them is that they lack a basic pistol back up weapon, the shotgun isn't always good over long distances, and it's so annoying to be out of shotgun bullets and H/A packs, and your suddenly defensless. Every other class has a pistol (exept for some speacial's) so why not the engineer?
Not being paranoid doesn't mean someone isn't trying to kill you... or does it?