It's not inferior, just overdone and becoming stale.
That' completely dependant on the general game mechanics, games are becoming overdone and stale, not modes.
i don't beleive Objective is superior to DM/TDM. however, in games like CoD the objective modes are horrible, so DM/TDM is the only thing worth playing, which pisses me off. In Brink, there is no DM/TDM, and Objectives make sense, which i like. I wouldn't trade this for anything, and DM/TDM does not fit Brink at all. So haters stop hating, and either go back to your CoD or get with the program.
I would trade it for both, while deathmatch indeed doesn't fit with brink, team deathmatch does. I'm not disappointed in it's lack of inclusion, but I would have liked to see it, and it would make sense. And those CoD comments should stop, TDM has been around for much, much longer.