My friends thoughts on overlords..

So I have these friends you see, and they seem to believe that OVERLORDS, or overlurds(if you're catz) are just SLIGHTLY overpowered... Their explanation for this statement:

1] They Scout

2] They drop creep

3] They can be used for drops [Upgrade]

4] They have an UPGRADE that increases their speed

5] They have the ability to morph into an overseer costing 50/50 to grant detection

6] The overseers can also drop Changelings.

So /r/starcraft I will let you decide.. Are overlords are REALLY OP? Or are my friends, just very misguided in their life?

EDIT: Chippsnsalsa & AyoJake are two of the three friends.. EDITx2: Mr_Automaticc is the third friend..