The 600 and 660 were ahead of their time.
Warning: Beware of often repeated Gun dogma.
Back in the late 1960s 8 to 9 pound, 24" barrel 30.06s and 270 were the norm. The 6.5 And 350 where as far from that model as possible. It was not until the 1980s that the idea of a light weight mountain rifle started to find favor with the general gun buying market.
Remington made the 788 and later the Model 7 that were/are very similar sized rifles as the 600, though chambered in more main stream calibers. Remington produced some 673 in the early 2000s but marketing was weak.
The dog leg bolt and vented ribs can be seen as useful or styling items. If one is to beat them up for their 1960s style, well that is in the eye of the beholder. I for one like the style.
Much like rifles chambered 338 Win Mags, 375 H&H, 416 Rigby, and 458 Lotts, these rifles were built to be hunted with not for an afternoon of target practice. A small, power, easy to carry rifle does come with some trade offs.
I have built several short 16 1/2 to 20" barrel hunting rifles over the years. 30.06, 7-08, 308, 30-30, the latest is an 18" barrel 8x57 Mauser on a 98 Mauser action. Sure the Muzzle blast is full strength but these gun where built be carried much and shot when needed.
If Remington where to build a new "600" rifle today, they would get rid of the magnum belted 6.5 and chamber it for 6.5 WSM with a short action and barrel. Possibly it could be build in 338 Federal? With the right marketing and sub MOA performance it would find a market.
Go out and shoot the rifle and see how you like it!...
Superman, you are a mean drunk