It's not too bad, it just takes a little work to understand how it works - and what doesn't.I'll weigh in on the opposite side.
I really like the system as it is. It gives me a real reason to get down low and fly slowly over the terrain, which is where I see the best sights and views. I also find it very engaging and immersive to search for the stuff. Plus I get a lot of satisfaction from my skill going up (by that I mean it's much easier for me to find stuff now, because I know what to look for). Skill and experience matter.
For me it's been one of the best additions to the game.
The system is amazingly useless at remembering what it has discovered. You do the scans and switch between various results of different species discovered - it will even tell you what they are.
<personal peeve>
Get down to the planet and it forgets everything - where the blue areas are and what types of plant were found - the accessible planetary data just has blanks of short-term memory loss. The only way to recover the information is to go back into space and switch back to discovery mode when the computer will confess to its little joke and show you all - just make sure you go far enough out as you are in SC and constantly on the move towards the planet surface, so don't waste time carefully examining the results and making written notes.
Anyone would think there wasn't an accessible terrain map that could be used to display what had been found.
</personal peeve>
Apart from that, the system works reasonably well, but its effectiveness should be judged against the explorer's frustration levels and what they think of the capabilities of 34th century computers.