BioWare does not dissappoint!!!!
ME2 picks up pretty much right where ME left off!! You have the choice of playing with the same created Shepard as in ME or you can change his or her look! Carrying over your character does give you an achievement!! The missions are numerous and very if difficulty! One of the few down sides to ME2 is scanning planets!! This gets very, very tedious, especially if you want to drain every single planet!! I started that way then a few hours in only started scanning "Rich" planets and then stopped scanning altogether!!
Another tweek Bioware did was the coversation wheel! This was only slight but made it very fun! The wheel is pretty much the same as in the original but on certain conversations you have a reaction button! During a conversation images will pop up offering instant "renegade" or "paragon" to interupt the conversation!! Just like in ME I went the route of renegade and I enjoyed every moment of it!!!
Overall if you like the original then you will definately like ME2!!! It is everything ME offered but more and more is always good!!!!!