(More modded Minecraft complaints. Yay!)
Ya know, for their "kitchen sink" pack and "successor to Monster," FTB Infinity is...kinda lacklustre. Monster had a LOT of shit, in terms of both tech and magic: it had Thaumcraft, Ars Magica, Blood Magic, Magical Crops and other magic stuff and as far as tech, it had almost everything RF (Thermal Expansion, Big Reactors, MineFactory Reloaded, et al), IndustrialCraft, BuildCraft, Forestry, RotaryCraft, ElectriCraft, ReactorCraft, and so on. It had multiple systems you could work with; if you didn't fancy one, you could go and work with another. If you didn't like IC2, you could do TE; if you didn't like either, you had RotaryCraft.
Basically, Monster had options, and lots of them. That's what "kitchen sink pack" friggin means: everything, including the kitchen sink. Infinity has no Reika's mods (RotaryCraft et al), and you're pretty much restricted to either RF or IC2 since BuildCraft migrated over to RF. Thaumcraft still has most of its addons intact, I don't think AM2 has updated to 1.7, its still got Blood Magic, but no Magical Crops. What's in Infinity is fairly good, but unless you purposefully restrain yourself, I can't honestly see worlds lasting very long before you get sick of 'em. Reika's mods, especially, add a good deal of longevity to worlds and require actual thought into how you set things up: you can't just plop a stack of engines down, combine their power, and have them run anything. Without going thru pretty much all of its tech tree first, you can't combine the power of more than 4 engines together, so you've got to use gearing and lubricant and a little basic math (multiplication and division, HOW SCAWWY) to meet the requirements of various tiers of machines.
I mean, on the server on which I'm currently playing (third time's the charm, eh?), I could (and actually am, because Rule of Funny) literally power my base using nothing but sugar and raw fucking sewage; I just need to get enough animals and sewers together and spam a tonne of engines, there's little actual thought that needs to go into getting my machines working at maximum efficiency. Not knocking KingLemming, Team CoFH, or their work, but I'd like something that requires more than time and space to get working at its peak.
FTB Infinity is alright, but its just...lacking. Its sad, because Monster is one of my favourite packs and seeing its chosen successor paling in comparison.