So you remember how you played Mass Effect 2 on Normal difficulty and you didn't care about any armor and weapon upgrades or you didn't have any motivation to mine the planets for minerals? Turns out that's just an odd balance choice from Bioware for this standard difficulty, where all the focus is on the story and not the combat.  
 
When you play the same game on the hardest Insanity difficulty you will face a completely different balance and it will feel like you are playing a completely different game. Essentially there are two games in one in Mass Effect 2. 
 
If you come to Insanity from Normal it will be quite brutal at first (at least for my 30-level soldier class it was), but that's when you are forced to learn the mechanics of the combat for the first time. And that's when you start to care about the upgrades of the armor and the weapons that the game has to offer (to get all of them you will want to mine as many planets as will be required). You also start to care about the team stats, I actually retrained my Shepard I think around 5 times until I found the combination that worked the best for my style of play.  
  
The main focus of this other game that comes inside the same ME2 package is on combat and RPG elements, the combat is so challenging and satisfying that I can't stop playing the game although that's my second playthrough and I know the story and usually I would be doing this only to get the final achievements, but not this time. I have finished hiring everyone except Legion for my team now and I can't wait until this workday will be over and I will continue playing. 
 
I haven't really had this kind of experience with any other game before.  
 
Great job Bioware (and Christina Norman)!