From pocketgamer.biz:
Gameloft was the publisher making the consistently highest quality mobile games in 2008, according to the PocketGamer.biz Quality Index.
The Index tracks ratings across major review websites, including Pocket Gamer, IGN Wireless, AirGamer, Mobile Game FAQs and Handy-Player.
Gameloft scored an average of 7.95 out of 10 across 145 reviews of its games. [...]