wow, some good answers and responses here!
Optimization? Min/Max? What's the difference? Sadly that wil depend on your viewpoint.
For me, the first sign that a character is Min/max'd is stats. are the 'primary' attributes set to the max of initial character creation, THEN enhanced with cyberware? Is there one or more atrrubutes set to the minamum for the race? This is a good warning sign that the player COULD be min/maxing (note i said COULD... some players have a concept in mind and can pull off such attributes, more later)
The next is skill selection and points. People who min/max generally focus only in one select area and ignore everything else. Thus you end up with a character that has his core combat (or magical, or hacking, etc) max'd out, then augmented with cyberware, and a near total lack of skills that don't somehow support the primary role. for example, you could end up with a character that has pistols at 5, automatics at 6, infeltration at 5, dodge at 5.... and nothing for any other skill! This, to me is an example of a min/max'd character.
Now, what about an Optimizied character? well, I'll put my own Face up to the acid test. The concept was a Face/pistoleer elf build. as such, he has good Charisma and agility (after racial bonuses, they are both 6, not including cyberware) his weakness is strength at a 2, body 4, willpower 3, initition 3, logic 2 (first thing I raised with karma). so as you can see, while he is pretty, and agile, he's not overly strong and initially not very bright... but can take a punch (or a bullet).
From there we move onto skills.... Since his primary role was as the group face, I decided to take the influcence group at 5, THEN pistols at 5. from there I spread my points around (pilot ground craft 2, armed combat (clubs) 3, infeltration 3, computer 3, hardware 1, and a couple other skills...)
From there, I picked out some contacts (ended up with 6, plus a free one from the GM, all at ratings 2/3/4)
and then cyber and equipment... first i got my equipment including 2 pistols ammo, armor and then my cyber... all said while the character wasn't 'Ideal', he was functional and useful to our group.
I think the biggest determination of min/Max Vs optimization is not actually the characters, but the GM and his style of play. some GM's are brutal in their style, throwing mooks equiped with betaware, security armor, automatics and dice pools of 16+ at their players (lets not talk about what they feel are ACTUAL challenges!) or have a simple, straight forward run'n'gun style to their games. These types of games promote Min/maxing simply due to either ignoring other aspects of the subtles of the game (sneaking,planning, schmoozing past the guards, instead of gunplay for example) or force the players to min/max (Tim's GMing this game, and I KNOW he will be giving his mooks wired reflexes 2, LMGs and dice pools of 14+. So in order to survive, I NEED to be better then that!)
If the GM is leveling the opposition of high caliber at the party from the get go, it forces players to Min/Max more then they Optimize. same with only focusing in on a single or dual aspect of the game while ignoring other aspects. Of course, the opposite is also true. If the GM is facing a game where the players are rolling 20+ dice from character creation, have nothing but combat skills and equipment to level a small city, he has only a few choices. Bore the party with card board targets, fustrate the party with social and stealth missions, or throw up challenfging opposition and ignore everything else.
Shadowrun is one of those games that is extremely hard to GM due to the wide differences in characters right from creation. Unlike pathfinder/D&D that has challenge rating for every monster, Shadowrun has "threat raatings" which really tell you nothing about the actual difficulty VS your players to any meaningful degree. I have seen a bunch of challenge rating 1 mooks TPK a party of 4 runners... and I have seen a dozen challenge rating 5 mooks get taken out in the first initiative pass by a party of 3...
If you are the GM and you are feeling that Min/Maxing is out of hand at your table, look to your GMing style and see if you could change up your style some. If you are the player and feel everyone else is Min/Maxing discuss with them why they are building their characters a particular way, or suggest to your GM to throw in a few little social/matrix/etc curve balls to the party (nothing extreme, but enough to show that having a more rounded character is to their advantage).... or, maybe it's time for you to find a new group of players that fits YOUR play style more? after all, we play this game to HAVE FUN! And if you're not having fun.... what's the point?