Couple of points:
1. Bear Grylls (like many other famous "Bushcrafters" and "Survivalists" on TV) likes to sensationalize things for entertainment, but he's constantly acting like what he is doing is real or valid advice in a "survival situation" when several of the things he's done/said have been dis-proven and in some cases down right dangerous to even attempt. In that regard, his actions appear irresponsible but I also see why a lot of folks these days don't have the attention-span to watch someone like Les Stroud or Ray Mears (I personally do, but that's just my preference).
This is why so many people in the outdoor community dislike Bear - he's acting (many of the things he's claimed on the show have been dis-proven, so to take him seriously as a "survival expert" based on the show is silly). There is all sorts of stuff floating around about his life before and outside of the show, but I don't care enough to dig into it and know the truth - I'm just not that into the guy or his show to put out the effort. Maybe he was Rambo, maybe he was a nobody, I don't know. All I know is that if one looks at him as what I consider him to be - purely entertainment and not to be taken too seriously, then he's essentially harmless (and somewhat entertaining I suppose).
2. None of the above has any affect on the knife itself (other than marketing - either pro/con based on opinions of Bear). Bear Grylls and Gerber are two separate subjects and opinions on one should have little to do with the other. To claim that the knife is crap purely because his name is on it without giving it a try is ridiculous.
3. That said, Gerber doesn't have the greatest track-record in the knife world. Neither does Bear Grylls' first venture into the Survival Knife market. So to be weary of the knife... well, that's just logical in my opinion.
4. The new Pro version is well more costly than the original version. IMO, a Mora Bushcraft or any of their heavy-blade versions could do most of what the first version of the Grylls Survival knife accomplished (and with better blade-steel probably out-perform most of the actual "knife duties").
IMO, for $50, there are a lot of options out there for a good "Survival" or basic Bushcraft knife. For upwards of $70 to $100, there are a crapload of options (many that I've owned and used) that are all way better suited for survival or bushcraft than what the Grylls Pro appears to be on paper, but I will probably never find out because at that price-point, I just can't justify getting a 9cr blade with a plastic sheath and a pull-through carbide sharpener. The Fire-Steel is cool, but again at that price-point, there are better options.
So, to say Bear Grylls is getting people into outdoors that ordinarily wouldn't - sure his show is more than likely doing that, but at the same time - is it bringing a bunch of new folks to the outdoors into the hobby with unrealistic expectations and unsafe habbits?
Is the knife a good knife for what it is and at that price-point? Not the new Pro version IMO - there are too many good options out there for less money and well better options for the same or just slightly more money.
But, that's just my opinion. I'm not Bushcrafter, nor am I a survival expert. I'm just a guy who likes knives and enjoys the outdoors.