I read that too and it makes sense but the thing that bothers me is that you doesn't exactly choose who stays back to hold the line. You can pick 1 person to escort the crew and 2 others to come with you for the boss but you're basically choosing who doesn't hold the line. What if you like having Grunt, Garrus, and/or Zaeed in your squad?

Not a big deal to me since I didn't lose anyone unexpected in my 1st two playthroughs, but it's kinda weird you may be penalized for taking one or two of those 3 guys with you in the end.

Mordin's death is not a glitch or bug. I believe that when people are surprised with Mordin's death, it's during the "Hold the Line" time where you leave crew behind as you and two squad mates move onward. Tech had their moment in the sun with the tunnel infiltration. A biotic is key for the protective bubble. The Hold the Line sequence is time for your soldier types to do their best.

Basically you want your best DEFENDERS to hold the line. Don't think about offensive solo strikers. Think about the guys that can dig down and hold a position with moxie. You want them to hold the line.

Under the hood, each character has a "hole the line" score, which gets a bonus if the character is loyal. Characters like Mordin, Jack and Tali are squishy and not exoeruenced with bunkering down and holding out for an extended period of time. Characters like Grunt and Zaeed are tanks who thrive on this type of work. The score is tallied for all the team members that are holding the line, and the number of survivors are calculated. If people are to die, the non-loyals squishies go first through the list to the loyal tanks. Alas, I think Mordin is at the head of the death list. Some characters can't survive without help even if they are loyal. Others can survive even if not loyal.

Here are some examples for the group holding the line:
Loyal Mordin by himself: He can't hold the line by himself. He dies.
Non-loyal Grunt by himself: Grunt lives. He hunkers down and gets the job done, and doesn't have to worry about helping any one else.
Loyal Mordin and non-Loyal Grunt: Grunt dies, but Mordin lives. Grunt is able to hold the line but goofs up helping Mordin... he was just too aggressive without his right of passage.
Loyal Mordin and Loyal Grunt: They both live.

Note it is possible to get non-loyal henchmen to survive through the end game with the proper group holding the line.

So what is a good strategy? Send back a loyal squishy with the crew, like Mordin or Tali. Leave your defensive bad asses to hold the line (hmmm, Garrus defended a base all by himself to an extended period of time....) and take your loyal offensive favorites with you to the end.

As for saving Kelly and the crew, you just need to make sure you go through the Omega-4 relay right after the crew is taken, and make sure you send a loyal squad mate back as an escort.

i thought the idea of sending a "squishy" back with the remaining crew is somewhat counter-intuitive. 2 separate teams fought through some severe battles to meet up at the surviving crew. how are we to assume that the road back to the ship will be a cake-walk? that is why i sent grunt back both times

destroying or keeping the collector tech? I destroyed it and it felt good to have the I-man pissed at me, since I never really trusted Cerberus. I also felt reaffirmed when after ward, all the crew members I talked to agreed with my decision.

I guess no matter what class you choose, you get to add one weapon of your choice at one point in the game(collectors ship)...I chose assault rifle for my vanguard....for someone that played a soldier, what did you get when you got to that point?

You don't really face them enough that it would be worth it