30-some years ago when I got started "pro photographers" (outside the journalism area) frowned upon camera mounted flashes and calling the use of this tool "lighting" would had made for more than a chuckle and a hiss...
How thing change, I still love my Profotos but I also learned to love the camera mounted flash, as any other tool, there is a right place and way to make use of them. They have limited power compared to the hefty powerpacks + crew of assistants but can also do wonders in the right setup.
I had this Nikon SB-27 that was a dream for a long time, simple but just great! Nikon could not fix it and believe me they tried so many times and failed at fixing it that they just gave up and sent me a new SB-800 which is a nice unit but I guess I am quite unlucky with this.type flashes, it went bad eventually, they "fixed it" 3-4 times, it worked for a while and it went bad again... Was really nice when it worked.
I prefer to use them as a "fill in" to complement available light, somewhere dialed in about half a stop under ambient light, also in a muggy day a warming gel as the ones used in cinema over the flash, about a half CTO would do wanders to warm up the image.
One trick for on the go portraits is to point the flash towards the ceiling and to have someone hold at a 45 degree angle one of those "flexfill" type colapsible reflectors, a piece of white cardboard works too, pretty much the effect of an umbrella in a studio beauty lighting setup.
Got a buddy that.does a lot of travelling shooting surfing, travel and sports, he does wonders with a trio of old Vivitar 283's and softboxes for them.
Biggest drawback on the "hot shoe" flashes is that you can't scream at them, well you can but you get funny looks from those around you.
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