That’s the case only in that ‘if you do low-level content, you get low-ilvl gear’. But that’s a wrong way to look at it for PVP. In PVP people don’t care about gear per se, they care about being competitive.
In all types of content in WoW, if you do that content, you get enough gear to get comfortable in it. With PVE this works by default because you gear up but your enemies do not. With PVP this does not work out of the box because, yes, you gear up, but your enemies gear up as well. In rated PVP, this is taken care of via ratings. In unrated PVP, this was being taken care of via either things like scaling / PVP stats, or best PVP gear being achievable from random BGs, although slower than from rated. Right now in SL they have nothing for unrated PVP along these lines, they removed everything, so people doing unrated PVP are screwed. They should fix it.
Just to be perfectly clear, the easiest solution that I suggest would be scaling of all gear in random BGs to a narrow ilvl range, similarly to WoD. Or, say, capping all gear in random BGs to the ilvl obtainable from these random BGs.
See this thread for more: