I have one of the new series Mini's and I really enjoy shooting it. I actually like the iron sights on it but I ended up putting a Redfield 3-9x40mm on it. I'm not the open sight marksman I used to be in my youth... The accuracy is fine for what it is, but if you are going to expect sub-MOA performance, then it's not going to be the rifle for you. There are a number of aftermarket solutions to improve accuracy; from having a trigger job done to an Accustrut barrel stabilizer. I'm not sure that any of them are necessary to enjoy the Mini, but some will probably help if group size matters to you. I've toyed with doing the trigger job myself. GunDoc has a Youtube how to video on it. It hasn't been a pressing desire but I can see how a smoother trigger action would help out my accuracy.
The mags are pricey, but if you shop around you can pick 'em up for a decent price. I think I paid $20 each for some 20-rounders from Hoffman's a while back. I also second the idea of staying away from the 3rd party mags; performance is just too iffy from most of them.
Overall, I'm glad that I gave in to my Mini obsession and picked one up. It's a fun rifle and I have always loved the look of the Garand style rifle.