Owning to this day Mauser 98, Mauser 66, Sauer 90, Steyr M52, Steyr Mannlicher Luxus, Winchester 70, Remington 700, Sako L61R "Finnbear", CZ 550, several doubles, etc. and having seen deployed G3, FAL, MAS 49/56, M14, M16, AK47, etc. I am honestly comfortable that the R8 is as reliable, and in many respects more idiot-proof than many of the above.
I base this assertion on owning all the above, and having used them from Europe to America, from Alaska to Africa, from Alpine mountains to Arizona deserts to Newfoundland snow, for 40 years.
Admittedly, I am part of the guys who never wipe their binocular lenses with the cuff of their shirt; who clean their rifle daily in the field, whether they have shot it or not; who do not throw them on the floor when taking a rest; etc. so I may not be your average grunt out there...
In 40 years I have witnessed or experienced myself a fair number of malfunctions (failure to load, failure to extract, failure to eject, detachable magazine loss, magazine plate going "bombs away", stuck case, etc.) and a number of mechanical failures (broken firing pin, screwed-on mechanical sights or scope base coming loose on high recoil DG rifles, loose bedding, broken wooden stock, warped stock pushing the barrel sideways, etc.) so there are a lot of things I check on a rifle before I take it afield.
I have also learned a few tricks along the way such as drying the rifle before field use to avoid oil freezing a bolt shut; excess grease hardening in a spring and slowing a firing pin strike, or preventing a spring loaded plunger ejector from operating; excess oil catching sand, dust and firing residues; etc. etc.
All I can say is that I own 3 R8 (my alloy receiver one, my steel receiver one, and my wife's shortened stock alloy receiver one) with 6 barrels, and I have now over 2,000 rounds on R8 in .223 Rem (many of those .223 for training), .270 Win, 9.3x62, .257 Wby, .300 Wby, .375 H&H, and I have yet to experience an issue. This is what I base my assertion on
The only imperfections I personally identify in the R8 are:
1) I would prefer that the magazine latches on each side would be beefier/deeper, but I have not experienced any actual issue, and the fact that the magazine can be locked in place alleviates any field use concern in that regard.
2) My wife has experienced a "Blaser click" when learning to use her rifle. She handled it too gently. When new, the action must be moved forward briskly, just like the slide on a pistol must be let to fly forward to achieve proper battery lock. I concur with Red Leg that this is an operator training issue, just like loading from the makrolon Steyr SSG69 rotary magazine requires significantly more force than loading from a single stack steel Sauer 90 magazine. Do not ride the slide when loading an auto pistol. Close a new R8 action briskly when loading.
On a slow quite feed the bolt can fail to be pushed all the way into battery. That is operator head space not a design flaw.