The Jaguars have plenty of issues, but their roster is getting healthier. Gradually.
There isn't a single team in the NFL that is immune to injuries. Injuries are a universally accepted component of football, allocated to the physical nature of the sport.
The Jaguars, like every other NFL team, find themselves plagued with untimely injuries each season. The difference between the Jags and the rest of the NFL, however, is that the Jaguars lack enough legitimate depth to overcome these injuries, much less turn them into a non-factor.
Simply, the Jaguars are still a young, inexperienced team and it is this reason (among others) that injuries seem to bite us in the ass year-in and year-out.