I guess James Gunn needs to finish his trilogy of films, but I could live without the rocket back story to be honest. Mainly GotG is about the humour and music for me, and I'm sure this will deliver on those fronts. Drax and Quill will deliver in the humour and maybe even more Mantis humour if the Xmas special is anything to go by . I'm bored of Groot (haven't seen the D+ shorts yet) but it looked cool with all the arms and blasters at the end and finally a new phrase "we are Groot".
Not my favourite MCU characters, but the humour will make it a solid 7 or even 8 of 10 film for sure.
rp2000