Carte is really, really fun!
-It has about 80% of Alteil's depth, which is amazing for any online CCG, really.
-Carte's card illustrations are great! Though the style is different from Alteil's, everything looks very professional and consistent.
-The CPC currently isn't that good, but it's still lightyears better than Alteil's. For $30-50 you can make any deck that you want, which is still pretty expensive. They are working to fix this.
-The staff actually listens to the community's suggestions and actively engages in discussion on the forums (the lead GM does read every single post)
-The cards are balanced. There are a few problem cards, but these cards are not game-breaking, and whether or not they're actually imbalanced in the first place is also highly debated.
-Constant progress. New features are always being added at a steady pace. New PvE options, hero leveling, and TRADING (which will make Carte an online TCG) are all planned to be implemented in the near future; expansions are released monthly.
-Global integration. Every localization of Carte is completely up-to-date, and everyone from every region of the world actually plays on the same server. Though some people have raised some issues about this; the Korean client, for example, was released quite a few months ago, so most of the players in Korea have large collections and a huge EXP lead, making it very easy for them to top the rankings in comparison to a U.S. player. This is also the reason why CPC is the way it is currently; I've heard that Koreans are typically more comfortable either A. grinding maniacally or B. shelling out cash than is the average American.
Anyway, I encourage everyone who is looking for a new online card game to play that isn't as depthless as Sword Girls or as... visually unappealing as Shadow Era to try out Carte.