How do I balance enemies to my group? Is this something you're supposed to pick up after you've played a while?
Critters or Augmented Animals, for example; how many and which kind are a 'fair' challenge? Or do I throw in what seems like the correct amount and fudge the dice either way?
There's no simple measure of this, as Shadowrun can mess with you with one lucky dice roll or some good terrain, positioning and tactics.
I have a couple of little comparisons I run through to help me be fair though

- Who has the better Weaponry?
- Who has the most combatants?
- Who has Magical support?
- Who has better armour?
- Who has the most favourable terrain?
- Who has the LEAST limitations (capture only, must save VIP, must get physical device etc)
Score 1 point for each of these answers, and tally up the results.
Anything at 3:3 is about fair
Anything at 4:2 is a good advantage
Anything at 5:1 is a MASSIVE advantage
Anything at 6:0 should be a certain victory
Note: I know there are more variables than this, and there are some terrain and limitations that in themselves give an amazing situational advantage.
But like I said, this is a good guideline. From here, have a few more thoughts about the specific situation at hand:
- Are there any Aces-up-the-sleeve that either side can pull?
- Are there any backup troops on hand?
- Do you have equipment that will specifically work/be nullified by either group? (ie one PC's Reaction is just too high for any grunt to hit)
- Are there any special actions that will be particularly useful here (Stealth, Suppressive Fire, Concealment, Traps...)
etc etc
Shadowrun can swing either way for any fight very quickly, so this is really a judgement call for every encounter. Hopefully the above will help
