Actually, having just booted up RCT3, Planet Coaster is not that far of it as we think. Yes in terms of coasters, everything else, we are getting there before the final release. Themes in RCT3 were actually terrible and Planet Coaster has superpassed it ironically with less themes. And you guys are right, they always said Planet Coaster will be a game as service, and that Planet Coaster 2 would probably never come.
RCT3 Vanilla had:
-61 coasters, 6 of them are track water rides like log flumes, splash boats, rapids...
-9 Junior rides
-27 thrillrides (some repeats with diferent themes)
-7 water rides, basically rides that use bodies of water like the small boats or the swans.
-18 gentle rides, basically shows, arcades, min golf... also has some reapeats, like 3 different small ferris wheels.
-6 transport rides, basically trains, monorrails... (transport water rides didnt come until soaked).
-14 misc rides, basically any track ride (things you could turn into dark rides or free fall towers)
TOTAL: 142 rides.
Funilly I found the game was pretty bad at theming and Planet Coaster with only 3 distinct right now is much better.
THEMES:
-Generic: divided between color generic english theme park walls, cristal walls, park garden gates, english house brick, modern city flats.
-Western: divided between western town and western ranch
-spooky: divided between spooky house and spooky castle
-Sci-fi: divided between martian bronze wall set, silver space wall set and bio gardens wall set
-Adventure: divided between Caribbean castle, sultan adventure houses, sultan marble palace
And fireworks shows that was probably the best thing to come out of vanilla.
RCT3 excelled on number of coasters and the firework show editor. It might seems Planet Coaster will not get to the same amount of different coasters on its release, but everything else, including themes, are going to be better.
The generic theme in RCT3 has been always been trash while generic in Planet Coaster has turned into studios/six flags modern theming, and its going to get also Main Street type of theming called americana, toally absent of RCT3. Adventure is actually much better in Planet Coaster already, its supposed to be pirate towns and castles, but thanks to it we have made roman theming, and more... the sultan buildings were always bad. Sci fi was als a prtty bit crap, although you had 3 different types of sci fi in the game. Planet Coaster is going to get sci fi becuase we saw it on one of the artworks, in fact is probably the next theme they show. Spooky was bad and the only way to get something similar to fantsy in vanilla. Fantasy in Planet Coaster seems so good, we will probably be able to get a spooky theming out it that is better than the RCT3 wall sets. Wester is were RCT3 excelled, and we dont have news yet of it coming to Planet Coaster, but im sure is coming.
Planet Coaster Alpha 3 has at the moment 23 flat rides (13 thrill rides,10 gentle/junior rides) and 20 coasters. 43 rides in total, without counting things already confirmed when released, like 1 or 2 waterides, transport rides (coney express was shown), wooden coaster and RCM (also shown), and rides like karts.
So its not as bad as it seem in first glance, Planet Coaster excels in the majority of things already, and still needs to be released.