At best Frontlines will provide a game for clanners to play for months to come and at worst it's a nice stopgap game while waiting for the next Battlefield game, Bad Company. MSXbox World's scores for Frontlines: Fuel of War were greatly influenced by their love for team-based shooters, be aware that your mileage may vary depending on your own personal preferences.
Kaos Studios has stated that they are committed to supporting the game for a long time to come through patches and DLC. Given their track record with Desert Combat, a free mod, Frontlines very likely has a good future ahead of it.
MSXbox World recommend anyone with a remote interest in Battlefield type games at the very least give Frontlines: Fuel of War a rent to see if the game is for you. They suspect that some folks who have passed on the title will be very surprised to find a really deep and engaging game.