I have a GameKlip and it's nice, but limited (they aren't universal--the one I have specifically fits my Galaxy Nexus and will be useless for my next phone). The complaint in this thread, however, is not about a lack of gamepads--it's about a lack of support for gamepads in Android games. Relatively few games natively support gamepads, a few more have keyboard controls that you can map to gamepad controls (easier said than done, as they usually leave you to guess/experiment to figure out which keys do what).
Most games can be played with a gamepad using touch emulation, but that requires rooting your device, which not everyone is comfortable doing.
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