Of course. It's a wonderful addition for fans. It can provide a different perspective on the events and concepts in the Mass Effect world. Reading it can make you feel more immersed in the universe, and you might discover new things that will make you appreciate the games even more. It could also introduce you to new ideas that were not as prominent in the game but are still an important part of the overall lore.
The Mass Effect comics can be somewhat canon. They often expand on the lore and backstories of the games, but their status can vary depending on how they fit into the overall narrative framework established by the main game series.
It gives more perspectives. By reading the fanfiction, we can see the game from different angles. Different writers have different views on the events and characters in Mass Effect, and this diversity of thought enriches our understanding of the game world.
Some of the best Mass Effect novels include 'Mass Effect: Revelation'. It gives great backstory on characters like Anderson and Saren. Another good one is 'Mass Effect: Ascension' which further explores the universe and its politics.
The length of the Mass Effect story really depends on your playstyle. If you focus mainly on the main quests and skip a lot of the side stuff, you might finish it in around 20 hours. But if you take your time, do all the side missions, and explore every nook and cranny, it could easily be 50 hours or more.