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Here's an arguement for both sides:

All these monsters have the same cost but have radically different abiliities (Dragon's being the unusual sac).
Accordingly, it would be quite possible to make cost clones that are very different from one another.

Personally, I like not having a clue what monster was just played because it makes CMC less rigid. By that I mean that when a match is going downhill, save for a major spell, it's pretty obvious who's going to win. Rarely do back-and-forth close matches occur. Not being able to tell at all what monster was played makes opponents hesitant and gives you a chance to make a comeback if they over- or under-estimate what you've played. I wouldn't call it random just like I wouldn't call Trap Cards in Yu-Gi-Oh a matter of luck; you lay down a specific card and it's up to your opponent to decide if their position in the match is strong enough that it's worth taking a risk and triggering the card or better to hold back.

On a side note, and this is probably a bug but I'll bring it up here in case it is intentional: sniping facedown monsters causes their name to come up in the side box (actions box, whatever it's called). Not sure if that was intended as a way to identify monsters.