You mean EE2, yes? I never thought of mooshroom farms, but I don't think I ever found any in my EE2 worlds. But on my "sky chest" world (where you start with a TT containing a minimal set of knowledge and just enough EMC to get started) I definitely used mushroom farming (then I made a massive RP2 cobblegen+blockbreaker array, which fed into a condenser, until I could afford to build a standard 'power flower'). And I also remember earlier, flowers used to be equal to half of an iron ingot, which itself was overpowered, to say nothing of bonemeal...
Agreed, though I only used EE2 with RP2 and TC2.
Thanks to Thermal Expansion, obsidian is already incredibly easy to get I suppose I could do with some enderpearls though... but I'm low on iron after making a 7x7x8 iron tank which I intend to fill with lava (but haven't started yet, as I need to figure out how I want to pump it, not having pumped lava before).
Pipe coming out of the output color of a magma crucible powered by a magmatic engine which if feed lava from the same output pipe from the crucible.
gold ingots, 1 glass and 8 pipe waterproofing thingys. Then you just have to supply netherrack.
Else make a BC pump.