The weird thing is, I can see where the designers planned for nuclear reactors to fill that mid-range role. Putting out a few hundred EU per tick in a single generator isn't actually a bad design plan. The problem is that they then made the cost too high for the EU it put out. For example, if a heat vent only cost let's say 2 refined iron and a design with 10 vents and 10 uranium cells put out 200 EU/t, it would be very competitive with a bank of 5 geothermals that costs about the same in iron and tin but puts out half the EU. But instead, to get 200 EU out of a reactor, you have to blow something like 200 iron and 400 copper.
We quadrupled it and it wasn't bad. I used it becuase a 4-thorium reactor was a nice long-running MV power supply that could be perfectly stable. But the essential flaw is there. Also, IC2 makes handling high power output somewhat painful. It's too bad that glass cable is so good and everything else is so terrible.