Cheaper laptops tend to have lower overall specs which means that there are games that they are just not suited to. In the case of MMORPG’s this can mean a compromise between stunning beautiful graphics and good game play.
Some of this has to do with your priorities as a gamer. If you are a solo player then sometimes lag won’t be an issue as long as you can still play relatively effectively. You can run decent graphics and still enjoy the game. However the best part of MMO gaming is playing with others. If you are going to participate in groups or guilds then you can’t have lag. You will need to put overall performance above all else, including graphics, when searching for the best cheap gaming laptop for your needs.
Free to play games are growing in popularity because they are growing in quality and value. League of Legends is probably the most popular example of this. The game has a large and extremely competitive community of players. The large character inventory lends itself to a variety of play styles and it has something to offer even the casual gamer.
LoL is technically and MMO, but it is a sub genre referred to as MOBA (Massive Online Battle Arena). The free aspect doesn’t mean it was cheaply made. The graphics are beautiful and the game play is as solid as anything out there.
Regardless of your budget or taste there are a lot of great games out there, so don’t feel like you are limited too much by your hardware. Remember that you can always scale back the graphics. The NES classics have taught us that good game play and fun experiences trump everything else.