I own an Mossberg 100 ATR. It's a 270 Winchester and it was my first centerfire rifle. I got it from Wal-Mart and, at the time of purchase, the price was the selling feature. I also own a Remington 308, a Stevens 25-06, and a Savage 243. The Mossberg holds its own against these rifles.
At first, I couldn't get it to group, but as I learned how to shoot, I found that the grouping problem wasn't with the rifle, it was with me. Once I learned how to squeeze the trigger and be surprised when the rifle went off, I found the rifle was extremely accurate and fun to shoot.
I handload and, with a load I found on the Hodgdon site, I can shoot a 1-inch 5-shot group. The rifle "fits" me well, I have no problem with the action, and it's got enough heft that it helps with recoil, but at the same time, it doesn't weigh you down in the field.
I've been pleased with this rifle and would have no problem recommending it to others.