That no longer happens. Broken Steel is canon, events are talked about in New Vegas with Ed-E. So this means even if you put the FEV into Project Purity, nothing happens, no one dies from it. The plain was a total failure, which means the Enclave being in Fallout 3 was completely pointless.
IMO the Lone Wanderer had the least interesting adventure and contributed the least to the Fallout Universe.
James & Catherine along with their science friends built Project Purity.
James figured out what it would take to get it to work.
Dr. Li got the Lone Wanderer in with the Brotherhood.
The Brotherhood got Liberty Prime working with no help from the Lone Wanderer.
The Enclave gets the GECK and they hook it up to Project Purity.
Liberty Prime does all the work destroying the Enclave at project Purity.
The only real contribution of the Lone Wanderer in my opinion is that he rescued James from Vault 112. But after that he just became hired muscle for James. Killed some super mutants and changed some fuses. I guess turning project purity on counts for something, but thanks to Broken Steel he doesn’t die from it.
Well the "bad guy" loses in every FO, so I'm not sure how your Enclave in FO3 is pointless.
Master loses. Enclave loses. Enclave loses. Someone loses(or everyone loses).
Also, LW meets Lyons Pride without Li. Kills Behemoth Super Mutant.
LW takes out RR.
LW also 18 years old. Fairly decent accomplishments for a youngster.
If comparrison with say courier, it the same..maybe greater.
Personally, I think what the courier does only effects the Mojave. Would his actions result in the destruction of Legion or NCR? No. Only factions that would be forecer changed are strictly Mojave. Boomers, New Vegas, House, etc.
If you just go by saving the world, it would be VD or CO, prolly warrior, too. If you go by ultimate sacrafice LW, and maybe warrior if canon says he gave up a brain(but is now possibly immortal).
All fairly similar in some ways, and each worthy for the stories they are involved with.