First of all, 'Crons are most definitely at the shooty end of the 40k scale. They do have some choppy bits and pieces, but by and large they bring the dakka. Unlike the other shooty armies (IG and Tau), they have the benefit of being very, very hard to get rid of due to We'll Be Back and good toughness on many of their units. They also seem to be more efficient when it comes to shooting. Their two main weapon types, Gauss and Tesla, do their jobs very well. Whilst you may have a 10 man guard squad babysitting a lascannon trying to snipe tanks, Gauss lets you rapid fire/glance it to death or at last shake it for a while. Similarly, firewarriors tend to be either static and shooting at long range or mobile and shooting at a short range. The 24" assault range of Tesla weapons lets you keep moving and putting casualties on your opponents.
As well as the aforementioned Gauss weapons, 'Crons seem to do very well at wrecking tanks. The Necron Lords with Scythes (and they should have scythes) hit like S7 monstrous creatures which is usually more than enough to punch through any rear armour. An Overlord on a Barge is a nightmare for tanks as he can just fly over them and deliver a bunch of attacks on the rear armour using the drive-by attack option of the barge. Likewise, Scarab Swarms go through armour like a hot knife through butter. In my last game 2 swarms ate their way through a Leman Russ and 2 IG Artillery Tanks without any problems whatsoever.
Crons also seem to be a very tricksy army in their own way. Maybe not as wacky as Dark Eldar or some of the Grey Knight units, but they can bring a lot of unique abilities to the field such as teleporting units, causing difficult and dangerous terrain tests, preventing enemy characters from fighting and also multiple 'test x stat or be removed from play" attacks. There will always be something new to try out with them.
Now for the downsides, Necrons are pretty poor in assault. Not quite IG or Tau poor, but definitely lacking in the kicking people's heads in department. They have stats similar to a marine except for an almost universal Initiative of 2 and a lower armour save. This means that they will tend to get mauled by any dedicated close combat unit. They have the option of taking attached Lords with the aforementioned Scythes which help add a little punch to the unit, but by and large most necrons units will get a mudhole stomped in them in the assault phase. BUT.... due to the fact that Necrons tend to get back up again after you beat them down, if the enemy fails to kill the unit or cause it to break and run (an Ld stat of 10 is also universal in the army), then the odds are the unit will regain some models at the end of the phase giving the Necrons time to bring up units which can dish it out to the enemy. Nobody tarpits quite like Necrons.
The other thing that I have found is that Necrons dont have a lot of AP2 weaponry. They do have some, but unlike most armies where there will be a melta/lance/plasma weapon in every infantry squad, Necrons have to rely on volume of fire to deal with Terminators. The AP2 weaponry they do have is pretty limited in the army, so you have to select the units who have access to it if you want to deal with terminators quickly (I played 2 of my 6 games against deathwing armies
).So thats my take on the army so far. They are certainly a lot of fun to play with so my new army wont be going anywhere anytime soon, but what do the rest of you think? I would like to hear from my opponents in the games I have played with them. Good? Bad? Cheddar cheese covered in extra strong stilton?
) before the scarabs came and chewed through the tanks. 
The Necron's cool abilities are fun and true to their 'robotic, terminator movie' inspiration. I guess we just have to find their weaknesses and exploit them which will be easy or more challenging depending on what army you have. As for me with Vanilla Marines, I don't think an old west shoot out is going to work, it may, but the chances are slimmer for me and better for my Necron opponent. A squad of Terminators, teleporting or in a Landraider getting up close and assaulting to clear a path, trying to get rid of the scarabs with concentrated shooting while my rhino and other transports try to get my marines into combat. Shrikes fleet special rule or Khan's outflank may help too.
