how come paul walker isnt the lead guy no more
They are trying to get away from the under cover cop in the illegal street car racing scene.
Like he kept a low profile in the first movie. However come the second movie, he was a lot more than just low key.
but i got to say the guy replacing him looks exactly like him and vin diesil at the end
It was Vin Diesil in the last scene. Check IMBD.
It's not that Vin Diesil Wanna Be they they got on the xXx - Death Of Xander Cage featurette on the xXx 2 DVD.
Over all, I did not mind TF&TF3:TD. At least the plot basis was different from the last too. However I liked the car races/cases in the last 2 film better. TF&TF3:TD's were mostly at night. And some of the shots were extremely CG.