When I first read them, my reaction was similar to yours. However, after playing the game a bit, I found that potions are actually really good. 10 HP as a minor action? Worth every penny of 50g. Healing is at a premium in 4e, and there are really no "big heals" available at all.
Another thing to keep in mind is that the money system is weird in 4e. What seems like a fortune at 1st level (1000g) becomes a pittance very quickly. 25 HP and a save for a single minor action?!? That is seriously badass, IMHO, especially if you're not a leader.
Also, even if your party has plenty of healing (which is something that's still pretty key to survival), there may be that encounter now and then where your TWF ranger finds himself saying, "Man, I'd give 1000g right now for 25 HP and a save." If your party has plenty of healing, you won't use them that often, but when you need them, they'll be worth every copper you spent on them.