Oops, just to chime in here: yeah, we're on a whole other level in terms of sound design now. The original effects aren't even something I'm looking at. We're using different mixing techniques, different mastering on the original effects themselves, positional audio and distance attenuation, an vastly MORE and higher-quality sfx.
So they won't sound so repetitive with just a few effects per type of shot or explosion, for instance.
Back when I was doing the sounds for the original AI War, we had to mostly work off of free sources, etc. At this point we've built up a library of 80,000+ sound effects, not plus 6 variants in many cases for those, and our general pipeline for creation and playback and so forth is completely different now. I'm not even going to open up the sound effects from the original game for any purposes. Just starting completely from scratch.
I haven't gotten around to that yet, but it's on my list for soon.