There are a lot of things to like about the ACR.
My favorite is probably the bolt release lever. The ability to completely tear it down without tools, including the barrel, is also nice.
My least favorite feature is the ambi safety. I can't get the rifle off safe in a hurry without adjusting my grip to prevent the safety from whacking my trigger finger. That's a pretty big oversight in my opinion and honestly, I'm surprised Magpul let that stand. I'll be taking a Dremel to my ACR to remedy this issue, which also bugs me... I shouldn't have to Dremel a $2k rifle IMHO.
With all of that said, I still like my ACR very much and will likely grab another one.
That seems alittle stiff. Mine according to a RCBS trigger pull gauge breaks at 6.5 pounds. Fairly clean break as well. I do have 2500 round down range and the trigger has lighten and smoothed out with use. Only thing I did when I 1st got it was put a dab of Rigg grease on the trigger/hammer where it breaks.......................Last, but not least the trigger really really sucks. Mine measures anywhere from 8.5 to 9 pounds! I have not heard this from anyone else, so I guess my ACR is out of the norm. Will most likely install a Rock River trigger (I have two R.R.'s and the triggers from the factory are fantastic - just over 4lbs. and crisp) or something similar in the near future.
But.... I do like the rifle!