Off Topic: There is never an excuse for taking a life...there can, however, be compelling and even apparently good reasons to do so. Sometimes the other options are worse./Off Topic
I think that the positive/negative consequences of Shep's actions will be much clearer, and varied, in ME3. Being the middle installment, ME2 had limitations on immediate consequences of actions since it would vastly increase the number of plot threads ME3 would have to be able to tie into. This isn't a problem faced by the final game.
For instance I can easily see Fist becoming a problem for Aria and Helena Blake may or may not fall back into old habits...And Toombs might be a problem for Paragons too. In ME2 the consequences for potting npc's in ME1 only seems to make Renegade options appear to be the one being punished (since they're, y'know, not there). It won't be until ME3 that we'll see which options bite Shep in the rear hardest.
As far as actual plot decisions (Rachni, Collector Base etc) I imagine that the will be both good and bad consequences for both Paragon and Renegade paths.
Wild Speculation Below:
Killed the Rachni? Then you shouldn't face them at all.
Saved the Rachni? Then you might end up facing indocrinated ones but if you deal with them, you'll get another ally in the fight against the Reapers.
Let the Council die? Then many races have probably built up their fleets (I believe the Turians do, anyway)...on the other hand they might be less willing to let you use them, but at least they'd distract the Reapers for a while longer.
Saved the Council (or the dreadnought they're on, anyway)? Then the races are less prepared to fight a war, on the other hand they're more likely to accept joint operations...
Blew up the Heretic Base? Then there are still active Heretics running around the galaxy, helping the Reapers, and possibly still maintaining active run-times within the Geth...on the other hand the Quarians probably like you alot.
Used the Virus? Then the Heretics are almost, if not entirely, gone. The Geth, with access to their memories, may or may not learn interesting things about the Reapers. But now the Quarians don't trust you so much and the Virus may have left the Geth vulnerable to further Reaper manipulation.
Kept the Collector Base? Then Cerberus is going to be harder to deal with, but you might find some interesting toys once you've done so.
Blew the Collector Base to hell? the cerberus might be easier to deal with but then the fight against the Reapers might end up being harder.
Modifié par Pharos, 06 juillet 2011 - 11:43 .