Out of all Merlin's British theme parks, Thorpe is definitely in the best condition, infrastructure wise. Mostly because it started to receive substantial development a lot later than the others, around the 2000 - 2007 period.
Although other parks lack this infrastructure, they are still in better nick, with flowing themed lands, quality theming and nice atmospheres. Whereas Thorpe just have a bunch of coasters and flats that are moderately themed. I doubt Angry Birds Land will be anything special, just a repaint of the old Central Park area, that lost it's theme to Pirates after the fire. The extension of Stealth Diner and the new show look good though.