My understanding of TTIP and TPP are that they're the US's last ditch attempt to standardise international trade along US lines before China overtakes and starts to set the tone.
On that basis they kinda make sense from a US perspective. From an EU perspective not so much.
(edit: not saying the US has a chance of staying ahead of China if TTIP/TPP are successful, just that standardised trade rules may soften China's negotiation position)
We really could use a standardized international trade treaty, but it has to be done in the open, and with input from more parties than just big corporations interested only in their profits, it needs input from environmental groups, workers' groups/unions, consumer rights advocates, food-safety organizations, etc.
My knowledge of history in this area clearly isn't strong enough; I have no idea how we got here.
Confindustria (the italian confederation of industrial companies) is strongly in favour of TTIP. Spirits exported to the US for example are heavily taxed, if they were not, we'd likely export more.
Or, if we get geographic denominations protection, we can get walmart to stop producing 40 things called "asiago" or "parmesan" (as it happened for german produced parmesan, or in reverse for the italian Tocai wine which clashed with hungarian Tokaji) and than it's a win for the producers of the real stuff.
Moreover in some things the US has _better_ legislation than europe, for example "bio" regulation is more strict, as are car safety rules, AFAIK.
I am not saying this will work out for the best, I am saying there are supporters of TTIP on the european side too.