They do have heads! Just because they don't look like the cartoon heads (which came after the toys) doesn't mean they don't have heads!![]()
Their robot modes may be less conventional compared to the other Autobot cars (because they're not as anthropomorphically humanoid) but that doesn't mean that they're bad per se. They have a head, two arms, two hands, two legs, two feet -- and the robots connect to mobile battle platforms. And okay, the heads aren't great - but they're there. And it makes sense when you take in consideration their Diaclone origins where Ironhide and Ratchet weren't the kind of conventional piloted mecha that the other Car Robots were, but were meant to be power-armours (kinda like what Ripley used in Aliens, only on a larger scale - up to 3 Diaclone pilots could operate one of them) that reinforced the other Car Robots by carrying munitions for them (hence the mobile platforms). This is what they were meant to look like.
Maybe Hasbro shouldn't have picked them for Transformers. Maybe these moulds didn't "translate" so well as sentient robots (I disagree). But that doesn't make the moulds inherently bad per se. Just because they're different doesn't make them bad IMHO.
What's wrong with their alt modes? I find them to be pretty good representations of Nissan Onebox Cherry vanettes. Japan has some pretty small vanettes and ambulances (I've been in one) cos they got narrow roads. Here are some photos of real Onebox Cherries:
http://gazou2.mbsrv.net/car/20110817_2131_2036.jpg
http://happy.ap.teacup.com/indigo-li...1298202428.jpg
http://en.wikipedia.org/wiki/Nissan_Vanette