This was the worst thing about ME2. The MAKO missions in ME1 got a bit tedious, particularly those hard-to-navigate planets. The scanner is worse though. It is pure work - probably not much fun for anyone after the first dozen or so planets, and nothing short of tedious in subsequent playthroughs.
In fact, it is the planet scanning system more than anything that is probably going to limit ME2's replay value for me. Just the thought of the 3-4 hours per run through that I will have to spend collecting enough minerals to do all of the upgrades give me a sick feeling in my stomach.
I LOVE planets. I LOVE exploration. I like the little write-up that they put in the game for each planet, and I actually do read all of them. The new N7 missions are very nice as well. I just hate the actual planet scanning system.
Here is my proposal for a fix:
1. Make resource deposits visible on planets. Have them show up as bright blue blotches varying in size and intensity according to how much ore they contain (obviously, you would use a different color on bright blue planets... color doesn't matter, just something that will show up). You don't know what kind of resource each deposit is until you move your scanner over it. doing so lets you know the type of mineral and exact size of the deposit. Basically the system would work the same except for there no longer being a need to perform a planet-wide grid search looking for the deposits in the first place. If you keep your scanner trigger constantly held down, and do a line by line latitude scan of an entire planet, it takes about one hour per planet to scan, this is even with the improved scanner. Using the scanner tap method speeds things up a great deal, but you are likely to miss several deposits, and it's very difficult to keep the scanner moving in a straight line with the XBox-360 controller if you're moving both the planet and the scanner in the same direction. Long story short, this is too much trouble. Making the resources visible on planets would alleviate most of the boredom here. You would still have to buy probes and mine the same way, you just wouldn't spend as much time searching on each planet for the goods.
2. Make minerals random. Put a general protocol in place for how many "Rich" "Good" "Moderate" and "Poor" planets that the game will have, and have the game randomly assign minerals throughout the galaxy (within the parameters of this protocol) whenever a new game is started. If they wish, the devs could limit Element Zero deposits to planets with organic life (where it seems to be mostly concentrated now). Garden worlds would also have a higher chance of being "Rich" planets, whereas gas giants would continues to be on the low end of the spectrum. The exact classification of each planet, however, would be randomized with each new game. This would encourage exploration and with the new scanning system in place, it wouldn't really be painful.
3. Keep the current scanning system for locating anomolies. It's fine.