My take on the new mechanics, after a little live time.
Preamble: I'm dancing the Mamba Mambo right now, which means I'm in a short-legged ship traveling a medium-haul route at roughly 40 jumps per Kylie. I am, of course, constitutionally incapable of traveling in a straight line, so this will be a roughly 20 Kylie round trip.
I say "the new mechanics", because taken as a whole there are a lot of good features to this update, and I want to be clear that I am reserving the bulk of my criticism for the FSS itself, not the 3.3 update.
Those good points:
1) The switch to collaborative exploration is a highlight for me; it's something that's been on my personal wish-list since the beginning. It makes sense that if I sell my discoveries to the galactic mapping service then that data will become public domain and visible to others. It's great.
2) The ability to discover planetary POI is very useful and a welcome addition.
3) The new lighting system makes star systems prettier.
4) The "telescope zoom" to view planets without needing to super cruise to them is handy; under the previous system the optimal approach was to get just close enough to scan, which didn't lend itself to sightseeing.
The mediocre:
1) The planetary probing is thoroughly pointless. There's no special skill involved, it's a just a time-sink, and the requirement to approach the body very closely increases travel time on approach and departure.
2) The stellar anomalies and planetary POI are underwhelming. Interesting, but not varied or especially interactive.
3) The Codex, which appears to function primarily as a short lived race for tags instead of a general search and information tool.
4) The move away from a science-based approach to the design of exploration - the Forge is a thing of (flawed) science - towards sci-fi woo-woo. Blue cockpit! Wiggly lines! Probe me, baby! Obviously, this is a sci-fi game, but it's a shame to see the existing scientific core further brushed aside. Tbh I'm puzzled that DB agreed to the direction that the game has taken post-release, given that the shift away from arcade shooter to Milky Way sim in FE2 through E: D was his approach.
The bad:
1) Lack of consultation by FD, and the clear contempt evident in the way that the new mechanics were pushed out by fiat without space for feedback or accommodation. The subsequent split and bad blood in the community.
2) The FSS is a time sink. It is a simplistic mini game - if there's any difficulty and challenge involved in the FSS I have yet to encounter it - dropped in as an excuse for removing the ADS, which - as noted upthread - was Sandro's stated aim all along. If the rest of the new mechanics had arrived sans FSS, all would be well. Finding truly interesting systems is much harder with the FSS, as to discover the sort of chance oddities that make exploration truly rewarding now requires a great investment in vacuous busywork - if anyone can stomach it long enough.
In summary, I'm not against 3.3 as a whole, but the stinking turd of the FSS is enough to dampen the draw of the good stuff, and more than that, the way this has been done has badly soured my feelings for FD, and alas! for some people in our formerly happy corner of the game.