The reveal of the Human Reaper was a little puzzling at first but having learned that the Collectors were traversing the galaxy kidnapping humans and melting down them into fuel for their creation was a fairly disturbing thought. In the end, my team took it down, but spared the Collector base for research. I'm happy to say my entire team made it out alive only to be greeted with, what looked like, an army of Reapers... so... bring on Mass Effect 3!

Are you talking about just the suicide mission at the end, or most Important choices in the game that are going to have a huge bearing on ME3 (fate of the Krogan, Rachni, Quarian and Geth) (the choices during your Characters loyalty mission). The choices that will affect the war with Reapers anyway
 

 I am going to assume the latter(so huge spoilers) 

Everyone survived for me, I was puzzled throughout the game though on how I didn't complete Thane's side mission. I updated him at every stop and his son still dropped that diplomat, guess i'll have to try again on my next few playthroughs.

Everyone lived for me as well. Just make the logical decisions for your teamleaders and specialists. Blew that station the F up, would be crazy to tempt Skynet!

I actually don't think they handled the ending quite well. If you spend the whole game developing your relationships with the characters and buying all the upgrades for the Normandy, it probably means that you don't want anything bad to happen in the end. It means that you care about your virtual crew, and that you want everyone to survive. And sure enough, in the end, if you do all that, everyone survives. But that's kind of boring in my opinion. It reminds me of a Rev Rant I've seen on Destrucoid where the guy said that games often give you what you want, and that takes away from the impact of the story.
 
Look at GTA IV for instance (spoilers ahead), if you chose to do what Roman wants at the end, he dies. If you chose to do what the girl wants (forgot her name), then she dies. The game makes sure that the person dying is the one you care about the most, which makes it way more emotional. 
 
I think at least one character should die in Mass Effect 2, no matter what. When eveyone makes it, the whole idea of suicide mission and sacrifice falls flat. 
 
By the way, I realy thought something bad was going to happen because I couldn't get Jack to be loyal to me. I thought she would betray everyone or something, but they don't even do that. :/

"I actually don't think they handled the ending quite well. If you spend the whole game developing your relationships with the characters and buying all the upgrades for the Normandy, it probably means that you don't want anything bad to happen in the end. It means that you care about your virtual crew, and that you want everyone to survive. And sure enough, in the end, if you do all that, everyone survives. But that's kind of boring in my opinion. It reminds me of a Rev Rant I've seen on Destrucoid where the guy said that games often give you what you want, and that takes away from the impact of the story. Look at GTA IV for instance (spoilers ahead), if you chose to do what Roman wants at the end, he dies. If you chose to do what the girl wants (forgot her name), then she dies. The game makes sure that the person dying is the one you care about the most, which makes it way more emotional.  I think at least one character should die in Mass Effect 2, no matter what. When eveyone makes it, the whole idea of suicide mission and sacrifice falls flat.  By the way, I realy thought something bad was going to happen because I couldn't get Jack to be loyal to me. I thought she would betray everyone or something, but they don't even do that. :/ "

On mine Thane and Mordin died...Thane didnt make it off the Normandy,got crushed by a metal beam. and Mordin died after I killed the human reaper,he was part of that team that was holding the collectors back...Does anyone have an idea why they died?

" On mine Thane and Mordin died...Thane didnt make it off the Normandy,got crushed by a metal beam. and Mordin died after I killed the human reaper,he was part of that team that was holding the collectors back...Does anyone have an idea why they died? "

yeah the gun was the only upgrade i didnt have...I thought that might have had something to do with it.

lol got crushed by a metal beam. my first playthru i lost like 4 ppl tho poor mordin was eating dirt after i beat the boss with no explanation of how

Managed to save everyone on my first try, thankfully. Here's what I did:
 
Legion went in the vents, Garrus led both Fire Teams. Jack used the biotic shield, and I sent Jacob back with the crew. Took Samara and Miranda with me to the final battle. Finally I blew up the base and told the Illusive Man to fuck off because I was playing Paragon, and surprisingly Miranda agreed with me and even quit Cerberus at the same time! I don't know if that's because I romanced her or not, but it was a really cool moment and made me fistpump a little bit.