Also Wrex and Tali that you mentioned getting.
Unlike Dragon Age, you actually wind up keeping/reuniting many of the same crewmembers across the trilogy, so they're fairly memorable by the end.
Once you have the Normandy, then yeah, you get the standard Bioware list of places to visit in whatever order you want. The first game also has a lot of basically random planets to visit with copy/pasted bases and such. If you dig 'em, that's cool, but just as a heads up, there's no real need to be a completionist. The second game replaces them with scanning for resources from orbit


