I'm not sure what playing an Engineer is like, in comparison to the other choices presented in the beginning. One thing I've noticed is there are occasional areas where Amanda Shepherd can do (what seem to be) specific things, which maybe aren't allowed for other "classes".
She was able to pick a lock in which a couple of people were hiding, for instance. When Eden Prime got attacked a couple of inhabitants hid inside of a pod thing, and Amanda was able to pick the lock and get some info from them.
Also, now she is at the Citadel (yet another similarity between Fallout 3), and she's hacked into a few minor computers. Not sure if other classes: Soldiers or whatever, can also do things like this.
Glad to bring back memories for you Lopov, during this long no-gaming phase of your life.

Mass Effect is incredibly fun, event though the situation for Amanda herself is pretty grim most of the time. She keeps getting accused of "screwing up" the mission and stuff. A lot of higher-ups in this game are really mean to her.
Normandy Spacecraft 🚀
Avina (... she reminds me so much of our modern Alexa...)
The CitadelAmanda's SquadEmily Wong, the Journalist (... we don't entirely trust her for some reason)
My 'toon can finally take a seat (... yikes, this game has pseudo lap dances!)
Fighting a ThugPwned! 🔫