So far, I'd say it hasn't been remotely as good as 3 and 4 (in the same amount of time played), but I knew going in that the plot sounded weaker than those two. However, it is just starting to improve some as I'm now a few hours in. The reviews were what convinced me to go ahead and buy it even after I heard the new voice for Igor that I totally hate
The Japanese voice actor died so they replaced the US actor too. And the graphics update definitely hurts my playability more than helps it. But that is just my bad eyesight talking.
Now if only I felt like playing it for more than 1-2 hours at a stretch. But then that is all I can stand to play any game these days. Can't sit for long periods without pain like I used to.
Edit: After a couple more hours the plot is now picking up and has much improved, some of the changes from the previous games are hit and miss but it is becoming quite enjoyable.