>>6480098It's a great time to be into City, but there is a lot of division on whether the current Castle themes (the sci-fi Ice Planet-inspired Nexo Knights or the sci-fi Ninjago) are truly "castle" themes.
Ninjago counts as part of the Castle line because Ninja was part of the Castle line, even though it's morphed into its own branch these days as a more-or-less replacement for Pirates (Ninjago has sky pirates).
Space is still just Star Wars. There hasn't been a new in-house space theme for years.
The Creator and Modular sets are amazing, and range in price from sets like the outstanding Corner Deli ($30-40 if you can still find one, they're discontinued as of this year) to the Assembly Square which is a mini-city all of its own. There's also Ninjago City, which is brand-new and one of the largest sets ever produced and is also a mini-city. That's not part of the Creator line, but it might as well be.
>>6480106Quality is slowly getting better in some areas and worse in others. The blindbag minifigs are made in China, so on occasion you get a piece break right away. A lot of other pieces are made in China now, but I don't buy enough new stuff to have a comment on the amount of cracking parts from new sets.