There really hasn't been a prequel that really kept to the original canon.
Not sure I agree with that. Many decry Enterprise for the way it introduced the Klingons to the humans (it's not like what was in the FASA RPG or
The Final Reflection!) or that they looked like the movie-era on Klingons rather than TOS versions (reason given in season 4), or the Romulans to the humans (again, not like the FASA RPG!) or that the Vulcans were hated by many humans and didn't act like the logical, stoic race we knew from TOS and later series (again, addressed in season 4)...and then there's the Temporal Cold War and the whole Xindi affair (which was never mentioned before on any previous series, so obviously, it never happened)...
But the thing is, it actually stayed pretty true to what was actually seen on screen in previous shows...the whole FASA and
The Final Reflection quibbles aside (as they were never canon), Enterprise, on the whole, actually either only took what came before and grew it, or addressed the differences with on-screen explanations that stayed within the canon that had come previously to the various shows...I'm on my third or fourth viewing of the entire series since I got the complete series set, and I'm not seeing it as a problem child...
Of course, many had a problem with the design of the NX-01, but, from what I've seen, that would have been addressed in season 5 when a secondary hull was added to the ship...you would have seen a definitive precursor to the
Constitution-class heavy cruiser of TOS...no, it would not have been a truly collaborative effort like the
Constitution-class et al were supposed to have been per the FASA RPG, but then again, the latter was never canon in the first place anyways...
Ruger