I have got a similar opinion like OP.

Ripple.com is a mix of Bitcoin-like currency XRP and ripple IOUs. As XRP is more suitable for payments than IOUs, it seems that IOUs would become only a secondary feature, and so it seems unfair to call this system Ripple. The difference from Bitcoin would be no mining, but starting a new server would be more troublesome because the peer has to find some (many?) peers that he would trust not to cheat him, ideally some peers he knows.

How about True Ripple? I can think of a system with just IOUs without XRP. It would also be truly P2P. There wouldn't be the global ledger but just peers transacting with (few) peers they know. All value transfer would be performed using chains of IOU transfers between peers, obviously. To prevent spamming there would be fees for all activities using up resources, like routing a search through a node, or routing a payment through a node. If a node sets fees too high then the traffic would route through someone else eventually. The actual interaction between nodes would need to be somewhat cautious, so the money don't disappear on a half-way, but it seems doable.