I voted for needs changing but feel i need to elaborate.
On the whole I dont like it, but I see why it is there. A team makes no effort to push, or can not get past the initial defense for the first point, do you really want 20 mins of that?
As I see it lockdown serves a purpose to kill a map once the attacking team have no chance of a win. On the face of it thats a good thing, but I would like the attackers to have to opportunity to "win back" some lockdown time under certain circumstances.
As an example I have seen instances where the defenders have used up all or nearly all of their re-inforcements in holding an early point, lockdown has then given the defenders the point early in the round, even though a couple of extra minutes would have seen an attacking rampage. This could easily be averted by slowing lockdown time or even having no lockdown once re-inforcments on either side drop below a certain point, say half the max team size when a result is surely close.
Also as a very minimum make it so there is no lockdown on the last point - make it a true fight to the death. Most players would welcome this because if it gets to the last point it has been a good round, and there is nothing more dissapointing than losing on a technicality.
TL;DR On most maps the attackers have it hard, and any tweak to lockdown to even the battle would be good IMHO.