Full disclosure - I have a GOTG Pro on order. Hopefully that doesn't bias this info too much...
Played GOTG on location yesterday. The game has a substantial amount of "play" code in it already with all eight of the main modes, both multiballs, a super skill shot, the hadron enforcer, shot and bonus multipliers, upgrades, mystery, outlane saves, etc. All outward appearances indicated to me that it shipped with a similar level of code as Aerosmith. The rules themselves are strikingly familiar with Aerosmith with many of the modes having similarities: groot MB ~ toy-box MB, orb MB ~ elevator MB, looks to be two wizard modes - 1 for playing all the modes and MBs, and 1 for completing them like Aerosmith, the two targets by Groot (I believe) light the right outlane ball save like the two on Aero, play three modes lights an extra ball, scoop shot for mode selection - mode selection available on plunge sometimes as well. The hadron enforcer targets are well implemented - it's nice to be able to go for a risky shot like those stand up targets knowing that the payoff is being able to hit the action button for a needed mode/MB shot. I paid particular attention to the ramps and rejects - the few times the ball didn't make it all the way around it came back to a flipper or was salvageable. From a geometry perspective, I don't think these are necessarily rejects as in the ball is banging back and forth and losing momentum, it's just that the ramps are really, really high off the playfield (maybe twice as high as many others) and you just gotta hit them clean. The single magnet effect was really fun and implemented well. Mechanically the game didn't have any issues other than really hard hits to the orb shot sometimes would not register quick enough and the drop target wouldn't come up in time. I didn't have any SDTM balls that couldn't be saved like some of the scoop shots from some Star Wars Pros I've played on route, or some of the kick outs on GB prior to the ball save code. It was really fun to shoot and from a player's perspective there is plenty in this game right now to keep it going. Oh, the artwork - yup, it's fabulous. Colors are crisp and vibrant. Franchi did a great job of painting the characters photo-realistic but still with his own style. The graphic layout was well done and the integration of the ball save lights in Star Lord's eyes is just so well done.
With that said, the game still needs a lot of work in the audio and video department as others have been keen to point out. I did really enjoy many of the video clips and some I thought were really well integrated - the extra ball vid for instance where he almost drops the orb made me chuckle, and the ball save, etc. There's quite a few in there that are well done, others need some refinement and a sense of continuity. Hopefully the mode code gets another few passes too - "Sibling Rivalry" especially I think could benefit from a few adjustments - based on the name of the mode you would think it would be a battle between Nebula and Gamora and the shots should relate better. I'd love it if they made Groot MB an option to pass or extend like in toy-box MB as well (seeing how so much else is copied over, why not copy over that great idea). Points in the game are extremely unbalanced right now as well - Groot MB all day long. 40 - 60 million on that MB versus a couple million here and there in the main modes. As I said in other posts, pinside needs to be careful what they wish for - - personally, I like the song "Cherry Bomb" and "Hooked on a Feeling" but wow, do they get played on this pin. I heard those songs for 3 hours straight playing in all parts of the bar on other games. I'm just glad there is pinball browser because those are probably going to need a tune up after a few weeks - unless of course somehow they get integrated better or someway STERN gets licenses to 5 other songs and can play them at random during those times.
In any case, I'm very excited for my game and despite what others have said, I don't mind getting to explore and know my game on early code and relish the updates as they come. You could say I'm part of the problem, but honestly I had a lot of fun playing GOTG as is. With a title this popular and a license that I'm sure was expensive, I would hope STERN can't drop the ball on this and will polish it all up nicely. And yes, if you already own Metallica and Aerosmith, you may get bored with this game sooner than later. I don't own those games so it's a win for me.