I've seen much praise for the StarNet AI but I've never tried it before. Could someone who has played it recently comment on how it compares with the current 3.4.5 AI? Does it feel convincingly like human multiplayer as some people claim?
Pretty much this. It's very meta-optimized per understanding of the meta (there are gaps in areas), but the real weakness is it's diplomatic/long-range planning.The StarNet and StarTech AIs have the following basic strategy:
1. If safe and chill, macro with a heavy focus on tech
2. If threatened or just because it feels like being aggressive, make fleet and attack soft targets
The only difference is that StarTech is never aggressive before year 40 (although it can build fleet earlier if threatened). So if you play with StarNet, the galaxy tends to be quite violent almost from first contact, whereas with StarTech it's "no rush 40 years" and then the AIs start bashing each other with more of an economic base. The era of strife, whenever it happens, tends to inhibit progress until clear winners start to emerge, because all sides are investing heavily in fleets but only some of those fleets survive.
It's not as good as an actual player, e.g. it can't pull off any surprise gamer moves tactically or diplomatically. Once you're used to it, you can figure out ways to outmanoeuvre it, e.g. by never starting a war that you can't win cheaply and by tech rushing even more shamelessly than it does. Still, because it does generically rational things while staying active, it feels better to play IMO than a galaxy of vanilla AIs who aren't even trying to win.