Its no problem although not ideal to intercept from above, happens every now and then. Those occassions are probably a 50/50 split between ATC induced and Pilot induced. I find it best to just correct as early as possible and I just don't mess around. I arm the LOC and GS, lower the gear, select a V/S 0f -1800 fpm and get myself onto the GS as soon as possible. The times I have seen it become a total mess is were there is only a half ass effort to capture with the pilot then just continuing all the way down high on the slope just within stable limits, I have never understood why you don't just correct early and be done with it.