GameZebo: The problem with the free-to-play (FTP) model is not that it exists. The problem is that some publishers who are in love with FTP implement the system in a manner that screws the player instead benefitting him or her. PopCap’s Bookworm Heroes is one example of a great game that’s dragged down by its FTP elements. It’s too bad we can’t just pay $1.99 and avoid stressing out over coins, pets, heroes, and the rest of it.
148apps: As cute and charming as other Bookworm games, Bookworm Heroes pits player against player in a battle of word creation.
Pocket Gamer: PopCap is one of the best developers in the games business. No caveats: not "on mobile", or "making casual games". I mean to say that in the entire industry of interactive entertainment, I reckon PopCap is the bee's knees.
STP: Bookworm Heroes may feature a cast of fighters and power-ups to aid you in your battle for word domination, but it isn’t anything to write home about.