Oh! I get to cross post this again!
I like Running Red. It sends a message, which is something most packs fail to do. It's a quick play, and very fun. It's mechanics are different than all the modern packs, and it's a real nice change. At first, there is some grind, but Gideon does a good job of changing it up. If you make the trip to the island, making all the blocks, there's a large supply of blocks there for you to use. You spend the time making the lava the hard way, he provides an easier way to do it. Everything you do is rewarded with a better and faster way to do it.
And I cannot make enough of an emphasis on the story. Running Red makes such an effort on telling a story, it's something that is rivalled by nothing else in the MC community. It's jam-packed *wink wink* with symbolism, and even if you don't see it all (I didn't), it's an amazing experience. And meanwhile, you're treated to new and refreshing ways to do things with new and interesting mods that are rarely shown by the other available packs.
TL;DR, it's definitely worth the download, and deserves it's place as a listed pack.