I'm about 26 hrs in and a little over half way now. I have full galactic readiness though. A lot of people are complaining about the endings but there are 3 different ones apparently. And to get the best you need to have a total of like 4000 points or whatever in the war assetness. My advice is to not jump to the priority missions right away. They don't go away since they further the storyline but the side missions will. And most cameos are made in those side missions. Kasumi's amused me cause it has to do with an indoctrinated Hanar.

Also also Tali's face is revealed! But only on a picture on your desk if you romance her. and it was a photoshopped picture of some stock photo xD But if you lot want to see it I know where to find/link it. She's mega hot!