I just realized credits are a big problem. Your ability to spend them is unlimited but your ability to earn them isn't. Having completed all the missions I hit a wall upgrading my weapons. I did a little snooping trying to find work in the uncharted sectors but they're disappointingly desolate. All those scans telling me about planets with miners and pirates and mercs and slavers and geth and they only let me land on one (for a rescue mission that lasted all of two minutes). Worse is all the money I spent on fuel and probes to do it. Space feels much, much emptier than ME1.