This can admittedly be different depending on the exact camp rifle available, but I will say that I did not enjoy my first safari any less by using the PH's rental rifle instead of the Blaser R8 that I had pretty much specifically purchased for this hunt. I had to bail on taking the R8 at the last minute due to some miscommunication around the permit and concerns with transiting in LAX and flying on British Airways.I have not yet been on a safari, but I plan to join the club in the next one to two years.
... I am confident I will enjoy the hunt more with my own rifle and not a camp rifle, but it would be nice to know a camp rifle is available if the worst should happen to mine. ...
Once I was in camp and had fired the PH's rifle on the range, I didn't think any of not having brought my rifle. My enjoyment of the Safari was in just being in SA, finding and stalking the animals, the company of the PH/Tracking during our days hunting, and the other hunters & PHs & property owners in the evenings for dinner.
I don't think it works well for any outfitter to have a bad camp rifle. Sure, they may be worn and nicked up a bit, but it shouldn't be bad shooting. That would cause too much work for an outfitter/PH knowing the odds of a miss or bad hit are higher.
The rifle I was using was an old Sako 30-06 (made in 1980s) with a basic Vortex 4-12x scope on it. But that thing shot very well and was comfortable. Other than my miss on a Springbuck, 4 other animals were taken with a single shot placed pretty much where my PH requested. By the last day my PH was confident in my shooting and I was confident in the rifle to take a cliff to valley ~280 yard shot at a Kudu, which went less than 10 yards after the hit.
I do plan to have things lined up better to take my own rifle next year. I don't think it will make the hunt all that much different though in term of enjoyment.