I think cap and gown covered most of it. I'll just add some additional information where I can.
1. About the combos, I know this stuff from ME3. So you are saying that in ME1 even shielded enemies will be affected by signularity effect, but it will not create any combos? Am I correct?
2. About the second answer. Is Adept only able to use pistols, or do you mean that he just starts with pistol on beginning? I will surely use Assault Riflle or SMG/Pistols if possible.
3. There's also one more question if I could ask. Are you able to continue playing after completing the final mission? Or does the game just ends without ability to come back?
1. Combos:
In ME1, there are no power combos. You can Lift enemies and then throw them I suppose, but that is generally a waste of how you would typically use your powers.
In ME2, only biotic powers will combo, but the combos work differently than they do in ME3. In ME2, Singularity, Pull, and Slam (lift portion only) will prime an unprotected enemy for a combo. Hitting this lifted enemy with Warp will create a biotic detonation (affectionally called a Warp Bomb by members on the forum). Hitting this enemy with Throw, Shockwave, or Slam will deal double damage and force to the enemy; Concussive Shot will also deal double damage and force to this enemy. Singularity/Pull/Slam > Warp combo is preferred if you have multiple enemies in close proximity. Pull/Singularity > Throw is preferred if you just want to send one enemy flying, preferably flying off the map.
In ME3, almost all powers can prime or detonate combos, and about half the powers can both prime and detonate. List of biotic and elemental (tech) combos by Relix28.
2. In Mass Effect 1, there are only four weapon types: Pistols, Assault Rifles, Shotguns, and Sniper Rifles.
Each weapon type has a talent tree that provides damage and accuracy bonuses.
Each weapon talent tree also provides access to a weapon-exclusive power:
- Marksman (Pistols)
- Overkill (Assault Rifles)
- Assassination (Sniper Rifles)
- Carnage (Shotguns)
By default;
- Soldier has talent trees for all four weapon types
- Adept and Engineer have only the Pistol talent tree
- Infiltrator has Pistol and Sniper Rifle talent trees
- Vanguard has Pistol and Shotgun talent trees
- Sentinel has no weapon talent trees, but can learn Basic Marksman at rank 6 of the Sentinel class passive talent tree.
Killing 150 enemies with the Assault Rifle will unlock Assault Rifles as a bonus talent.
Killing 150 enemies with the Sniper Rifle will unlock Sniper Rifles as a bonus talent.
Killing 150 enemies with the Shotgun will unlock Shotguns as a bonus talent.
Killing 150 enemies with the Pistols will increase the duration of Marksman by 25% (applies to all current and new Shepards).
Bonus talents can only be chosen when starting a new game with a new Shepard. You can select only one bonus talent from a list of unlocked talents.
3. Are you able to continue to play the game after the final mission?:
Mass Effect 1: No.
MINOR SPOILERS:
- After completing the four main story missions (Therum, Feros, Noveria, and Virmire), you will be forced back to the Citadel. After you leave the Citadel, you cannot go back, but you can still travel the galaxy to finish any available missions. Going to the planet Ilos will trigger the point of no return.
- Some secondary missions require you to return to the Citadel to mark the mission as complete in the journal. It is recommended that you complete Virmire last to avoid this problem.
Mass Effect 2: Yes.
Mass Effect 3: Sort of. Completing the game will kick you back to a point just before the point of no return so you can finish any open quests.