I played Engineer all the way and loved it all the way. I loved it best in 1 though...sure, the combat drone and incinerate and all that are plenty of fun, but I probably wouldn't have dedicated so much to the trilogy if I never fell in love with those tech mines!
Yes, and I made a character for each class. Each character I made was made in ME1, then played through all three games as that class. Only thing is I haven't finished ME3 with the infiltrator yet, and haven't really even started with the sentinel. --- There are 10 types of people in the world. Those that know binary, and those that don't. GT:Talon Omega. If you send an FR please tell me where you got my GT.
I've played every class in all three games; sometimes I stay the same between games, sometimes I change.
I usually try to keep the changes 'believable' though- an Engineer might become an Infiltrator as Shep focuses more and more on combat, or an Adept might be 'damaged' by the rebuilding in ME2 and come out augmented with tech to compensate- a Sentinel. I guess you could come up with reasons for just about anything but I wouldn't change an Engineer into a Vanguard, for example. --- "The act of treachery is an art, but the traitor himself is a piece of ****." - Mike Tyson