Youll pay more money for less power in a gaming laptop, and raw performance is often compromised due to the challenge of balancing a small form factor with the heat output of higher-end graphics cards. Many gaming laptops look like Neo threw up all over an extra from Michael Bays Transformers films. Size can also be an issue, making many feel like enormous chunks of plastic, filled with screaming fans desperate to keep everything from overheating. And they are hard and sometimes impossible to upgrade.
Source: N4G PC How I became a gaming laptop convert