While Borderlands is a good game, Borderlands 2 is much better, I would recommend playing through all of BL2, and if you like that a lot, then you might think of BL1. There is not enough plot points missing form the first game that you will feel lost in the second game. Make sure to try out the BL2 DLC tha is all includied in the handome edition, it is really good, and has really good loot.