Tiger miniatures models are variable - I've got some of their Spam-Am American Marines, and they are fine. They certainly aren't Perry or copplestone level, but they are probably better than old glory and about the same as early redoubt. (although fairly chunky & tall). Heck, I even got compliments on them last game they were in!
Then again, I also own their Herro/hotentot figures, and they really are ugly sculpts. Not a problem for what I wanted them for (conversion fodder to be made into low grade modern african militia), but if i had brought them specifically then I'd have been disapointed.
I've always had really good service from them, and in my experaince they dispatch quickly. They are also comparatively cheap figures.
So, overall, I'd say that it's worth picking through the range. There are some very poor bits, and some reasonable bits. Perhaps the best bet would to be order a pack of the set you want, and then go from there?