Recs.
Updated
SpecsUpdate
Pros
Pro Impressive graphics, especially for an open source game
Open Source games are not always known for their high-quality graphics. This can often be caused by the games being designed by committee in that many different people may work on the graphics, even in the same areas, which can cause plenty of inconsistencies. Luckily, Xonotic does not suffer from this problem as the whole of the game has consistent looks that are actually quite impressive.
Pro Interesting weapon design (for an arena shooter)
All arena shooter basically use Quake or UT weapon system. However, Xonotic has an interesting variety of weapons (larger selection than most) with elements from both UT and Quake but added some of their innovative ideas. Some of the weapons have a bit of overlap and felt a bit forced, but other weapons really made the game stand out.
Pro Multiple floor levels gameplay
The game permits players to move across multiple floor levels, which permits more dynamic game play.
Cons
Con Boring AI bots
Bots are not the most performant opponents in Xonotic. They often run around the same paths, and sometimes even stand still on spots for apparently no reason.