With the planet taking, deepstriking, normal fleet operations kind of thing, there are smaller parts to it that can be taken separately. So yes, getting to an ARS may be tedious if it's 6 planets away, but picking and choosing the planets, colonizing them, neutering nearby planets, there's always something going on that's getting towards an ultimate specific goal of getting to the AI homeworld, and it doesn't always require a full fleet action. I think the "battlefields within battlefields" thought process for how planets were constructed to be dealt with is the main point making this process not tedious. Take out a guard post, retreat to deal with something else, pop back in and take out another few guard posts, deal with the response, there's a nice feeling of progression. Also, once you've taken out the ARS planet and colonized it, that ARS is instantly yours - no need to drag it back to your homeworld, and it provides an immediate benefit (mk1/mk2 of a new ship type), plus the planetary benefits if you can hold it (+3k knowledge, mostly).
Shard recovery is a decent chunk of time that you need to devote a good portion of your fleet to babysitting an object, with nothing really being advanced until the shard actually gets to your home planet, and even then there are so many resources involved that just having the shard doesn't really mean anything, and it doesn't really advance a player's position in the galaxy until you've blown over a million of each resource. I realize that playing the FS campaign is supposed to shift difficulty to the beginning/middle of the game and postpone the rewards until later (opposite the normal game, where rewards are beginning/mid with grabbing ARS and such), but some kind of immediate reward for successfully grabbing a shard would be a nice touch.
About the normal/epic discrepancy, it's not really been much of a problem, just wanted to bring it up for a balance question type thing.
Forgot to say this in the previous post, but overall I think this campaign was an excellent first attempt, and has been quite fun and different than the normal game. Consider it AI War Campaign 1.0, and in a year or so you'll be up to AI War Campaign 3.0, with lots learned and huge changes to the mechanics to make things better.
I largely agree with bob's post above mine (ninja'd!)
Edit: I've also been on the LotS demo, since I'm waiting for it to come out on Steam (so comments on capital ships making fleet ships obsolete isn't EXTREMELY well informed), but really if there were any reason I were going to not pursue the Fallen Spire campaign, it would be shard recovery.