From a dev perspective, it's probably true, although in some cases, with a creative developer, they can come up with costumized stuff that Live makes very difficult to do.
But PSN itself is fine, although Live is still better. Drives me crazy that very few PSN games have trials, I refuse to buy a game with no trial, and there are no "game pages", an easy access to every download, screenshot, and info on each game, like Live has.