Sure, Hope does a lot of stuff, but most people I talked to don't think he did anything useful.
To be fair to Hope, neither did anyone not named Etro, Fang, or Vanille (although I guess you could say that Lightning disrupting the train at the start was useful since it got Vanille off of it (and Hope and his Mom)).
To break it down, after the train, you have the lake, the junkyard, the forest for Lightning and Hope, the abandoned powerplant for Sazh and Vanille, Palomporom for everybody not named Sazh and Vanille, the Not-Goldsaucer for Sazh and Vanille, and the airship where the band gets back together. During all of this, the party encounters no major events or opposition outside of unlocking Transformers, Lightning's little rant about being pets, Hope's Operation
Gank Snow like a little bitch Named after my so very dead mom and ironically Snow's previous operation since Nora seems to be the 'in' name right now
Nora, Snow meeting with Cid and Fang (offscreen), Snow attempting to aid a bunch of random villagers/Hope's dad (and failing miserably in every conceivable way possible), Snow and Hope making up, and whatever the fuck went down over at Not-Gold Saucer (that shit made no sense and only existed because the cutscene existed and "We promised to put it in the game dammit."), and meeting with Cid with the party proper on the way to the airship.
After this is the airship and the Space Pope and the named villain who dies like the bitch she was (in fact all she does during the game is haul in Vanille and Sazh after the Not-Gold Saucer bullshit and tries to go through every color coded alert in the book (Dammit Space Pope! She was two days from making it to White Alert. She didn't even get to go through Purple with Yellow Spots, Blackwash Plaid, Barbershop Stripe, and Beige Alerts.)), the cocoon of Cocoon (where a crystal zombie Cid betrays the party to go all One-winged Angel and die fighting against them; at least until he gets better, becomes the new Space Pope, and gets betrayed and shot to death by his own men), the training montage that is Land Down Under (with the side attraction of "Whatever happened to Pulse") and Space Pope MKII, after that is that one cutscene where the team crashes a race, then they bump into the third named villain who turns and helps the party out (I guess, actually I don't think he did anything beyond shouting at people through a megaphone in either case; maybe you get into a boss fight with him, I don't actually remember), and then the grande finale with Space Pope Rivale and Orphan
The only purpose the fights with Space Pope serves is to serve as a barometric for him to see Fang progress from being the Ragnarok Orphan wants, to becoming the Ragnarok Orphan needs. Likewise, all the battle with Orphan accomplishes is wasting time since Fang isn't falling for Orphan's scheme, and motivates him to step it up by zombifing the majority of the party and ryona-ing Fang in order to force her to take the Ragnarok option, which she does. Then Etro steps in and via Deus Ex Machina frees the party through a technicality which calms down Fang who then symmetrically docks with Vanille to slay Orphan and form the crystal pillar that ultimately foils the plot.
Point-for-point, and pound-for-pound. Very few people have any actual relevance to the events of the game, which to be fair, isn't unexpected given how only a handful of people have a role to play in the plot of the sci-fi movie Logan's Run (of which this game is Squeenix's attempt at remaking; not that the liberal application of anime to the plot helped matters at all).