As much as I love to hate on ARs, by any objective measure they're a very capable platform. They don't weigh much, they can be superbly accurate, and as long as you squirt a little CLP in the action between firefights they'll go bang as long as you squeeze the trigger. You can't ask much more from a gun than that!
As for feeling "airsofty," there's a reason - they are. That is to say, the airsoft guns are made of similar materials, and therefore feel similar. This is a compliment to the airsoft products rather than an insult to ARs, since I have never heard of durability issues with any line of ARs except limited cases of stretched receivers over extended firing.
I've never been a fan of the direct-impingment action on ARs because, being left-handed, ever AR I've ever shot has flung propellant gases into my eyes, and I don't particularly care for the whole concept in the first place... poop where you eat and all that. Starting out on piston-powered Commie guns didn't help, nor did my experience with delayed-blowback in my HK93 clone. That said... if the DI system wasn't good, we would know by now. It might require a bit more cleaning, but it's lightweight, reliable, and contributes to accuracy... And I've never had a malfunction in any of the times I've gotten to shoot borrowed ARs.
I'm not convinced that 5.56 is the best caliber for a battle carbine, but there are two things that make this irrelevant: first, nobody cares about my opinion when there are plenty of people dead from 5.56 caliber holes, and second, if there ever were a platform with lots of cartridge options, the AR would be it. I like the AR in 9mm, .308 Win, 6.8SPC, the 458 SOCOM, and the .50 Beowulf. There are others, take your pick.
Summing up... ignore the idiots, forget how dirty DI can be, and buy a bit of CLP with your first AR. It probably won't be your last.