I read some knee-jerk reactions on after Shubin published that was facile drivel and unworthy of a response. I am not aware of a more recent objection if there is one.
The key thing about Tiktaalik is that they went looking for it in a specific rock formation that was exactly the right age for the transitional form they hoped to find. Evolution makes predictions that can be tested in the real world.
All creationism would have to do to prove evolution wrong would be to find one fossil of a modern species in pre-cambrian rock. Every one of the millions of fossils ever found is in the sequence evolution predicts.
Tiktaalik is just one of many transitional forms bewteen fish and reptile. The development of limbs as well as the jaw and inner ear are all described in detail in the fossils.