Wikipedia is editable by anyone. And no one has come through dd-wrt here that I didn't give them the password to do so. No one. I used to watch the logs while the NK and CN folks hammered on it for hours at a time, but that got boring although I did occasionally cost someone their net account if they were being a big enough pest to DDOS me. Those sorts of attacks have actually decreased, I think they've some sort of a fingerprinting thing now that tells them if its a vulnerable target, so they don't waste a lot of time doing dictionary attacks like they did 5 years ago. The proof is in the results.
I once bought a Siemans router back in my greenhorn days, lasted about 15 minutes before somebody bricked it. I made circuit city eat that one. I had an old slow wintel box with 2 net cards in it that I ran the X86 version of dd-wrt on for 4 or 5 years, stripped, headless, booted from a CF card switched read only. It Just Worked(TM). And this much lower power consumption Buffalo NetFinity with the real dd-wrt reflashed into it has now been standing guard for about 2 years.
So all I can say is, let the results be the proof you need.