The SA80 A1 family of weapons, of whish the L85 is one variant (there's also a Light Support Weapon variant and a new carbine version), was a quite bad rifle. I say quite bad because it was blown out of proportion by the press wanting to take a dig at our government. It is an accurate rifle, especially with the SUSAT optical sight. I've never heard of one falling apart when fired, but the problem with the magazine falling off was rectified very early on. However, it was very unreliable. This was mainly because it required a high level of maintenance, which was just unpractical on exercise never mind operations.
There was also a problem with the feed of blank ammunition, due to the fact that the blanks we use have a crimped tip. This coupled with the fact that the rifle required even more maintenance when firing blanks (they throw out a lot more carbon than ball), lead to the troops having little faith in it. And rightly so.
The SA80 A2 is the new version which has undergone extensive modification. It is now an extremely reliable weapon. The initial tests in Oman, Norway, Belize and UK put it among the best assault rifles as far as reliability goes. Once the stats of how it performed in Iraq filter through the army and eventually to the public, I believe it will become a very highly regarded weapon. The problem with the feed of blank ammunition has also been rectified with a new magazine specifically for blank rounds, which will give British soldiers confidence in the weapon.