Here's my experience. Easy inexpensive seeds, you can buy anywhere (except perhaps China?) and be satisfied.
Seeds that are rare (likely to be old), known to be difficult to germinate or expensive are problematic. Before buying, try to find out about the seeds and the vendor.
Most times seeds are not expensive, at least not anywhere as expensive as plants can be. So take a chance, have some fun. Many times you'll be disappointed but often you'll get some really nice, interesting plants eventually.
If certain seeds are a strain on your budget, that's the time to really be cautious.
If you follow this advice, then you can order from anywhere with the proper attitude and enjoy yourself.
That goes for Rare Exotic Seeds also.