Gruber designed both plans, he disagrees with you.
It is true, Obamacare borrowed some things from Romneycare, most notably the mandate. But other than that there is very little similarity between the two programs. Obamacare is a typical Democrat entitlement program, a huge one size fits all scheme, designed to redistribute wealth, raise taxes, and dramatically increase the size of government. Romneycare was very modest in comparison and did none of those things.