Sadly, I must concur with the opinions of colleagues here. I do like their Pershing range for what it is, but the WW1 stuff, although one of their better ranges, is very hit or miss.
We have a saying in the States among wargamers: with Old Glory, you generally get what you pay for.
At the very least, be prepared for bizarre poses, miscasts, broken weapons (bayonets, rifles, lances, swords where applicable), weakly cast standards, etc.
Even if you can deal with all this, the effort required to trim off massive amounts of flash, replace weapons, bend guys back into shape, sort through useless poses, etc, generally means that you've just spent any money you've saved in terms of time and effort.
Now, some of the newer ranges are better, and I still like some of their Ancients (I have a fondness for their Late Romans in leather armor); the old Alsop stuff (particularly the Marlburian range) is also quite good. BUT, when you can do better, by all means do so, especially as some of the other ranges are nicer, and not much more expensive.
On a side note, I have not seen their Austro-Hungarian WW1 figs, so can't comment on them, but the other stuff is definitely average at best. It's also worth noting that their official website is now "oldglory25s.com", NOT "Oldgloryminiatures.com", which is an alternate site, and doesn't have all ranges listed (though it does, bizarrely, have most of the photos).
I'll also say that their scenery, ships, etc.. are actually very good. (The buildings are awesome.) It's the metal figures that I (and most) have a problem with.
-Doc