What most of us played as S2: Silent Storm is as far as I could tell a golden version of the original game with expanded campaign, more content and an English release. The original game had a ton more mods, though.
H&S is nonlinear to the point of you being able to completely get stuck. It's rough, unpolished and absolutely brilliant at times. You're essentially a soviet commando sent to prepare post-war germany for a possible preemptive invasion, so, you recruit or exterminate nazi hold-outs, create partizan cells, assassinate or bribe US army officials. Plant bombs at market squares or help the british catch those who would and eventually had a show-down with, big surprise, thor's hammer and you get to remove them or join
>guess I was playing it wrong
It's not really playing it wrong. The engie benefits from some general skills such as snap shot and reload. Those are excellent for almost anything. Sniper needs to grow into his role which by nature is generally late game and overkill.
I mean, heavy or soldier would be better for the more dakka approach but engie is a bit less married to his weapon and is decent with all of them. Being able to pull out a panzerschreck from his ass and level an entire building in one (quick) shot is also good fun. Hell, I think he's the only one able to pull off several rocket attacks per turn.