A good sentence for specifying "without considering something" formally
Solution 1:
Notwithstanding indiscretions in methodology, the value of the work is irrefutable.
That's formal
and stuffy
with a readability score at the college grad level.
Notwithstanding that, B.S. still sometimes baffles brains. ;-)
Solution 2:
The way you worded it in your question is fine.
An emphatic locution would be "in and of itself" — The work is valuable in and of itself.
A single-word modifier would be "intrinsically" — The work is intrinsically valuable.