These are all commons. Commons shouldn't have downsides; they should be all upside.
Uh, these are commons? Where did he say that? From looking at them, they look like rares, though that is because of the drawback; really their effects aren't generally rare. The first one is an uncommon, the second and third are commons, the fourth is common or uncommon, and the last one is a rare (reanimation effects are almost never common anymore, and this one is much more rare-feeling than uncommon-feeling).
Thinking of the Great Designer Search, a lot of the cards people suggested had drawbacks, and time and time again the judges hammered them for this. I think drawback as a mechanic is rather uninteresting. Also, I don't think these are good enough to justify a drawback.
I think its more "these aren't cool enough" rather than "these aren't good enough", though maybe you mean the same thing.
Also, it IS okay for commons to occaisionally have drawbacks, but having an entire cycle of drawbacks is probably a bad thing, especially if they're pure-downside drawbacks. Sangrophage and some of the various black commons have drawbacks, which is okay, but they tend not to be crippling (though a lot of these, such as Sangrophage and the boggart from Lorwyn, are just bad cards). More importantly though, if a card at common has a drawback, it should have a VERY obvious upside. For instance, Echo is a fine mechanic at common because people see it as "this creature is cheaper" rather than "I have to pay for this twice".