ST was my second game. Good game but it did get a bit old after a while after playing it a lot. It got to a point where it seemed like a lot of work to feel like you accomplished something.
SW is a fun game but I wouldn't get it unless you can find one cheap. It can be a punishing game where you drain on plunges 3 or 4 times in a row. I still enjoy playing it and the shot multiplier feature is great.
GB looks great and fun for a while but the awful mechanics of the game make it frustrating. Not many games I have no desire to play at all but GB is one of those.
I have not played GOTG much but not really impressed with it. Just seems like a lot of things thrown together. Guess I played early code or just don't know the rules.
Iron Maiden looks pretty cool but have not played it. I just don't think I can take the music in the home environment. I haven't played Deadpool either but not really impressed with that one.
Metallica is the best Stern game imo. It has great art, great dots, balanced scoring, and great code. Pro is great and relatively cheap since so many are out there. Some say it gets repetitive which is somewhat true if you don't really know the rules. There are not really modes so you are constantly working on different things and playing out things as they come up. Getting to a CIU mode is not that hard and you feel amazing where you get that 2x multiplier and cash out a great bonus. Downside is that it does not have the new LCD display. Colordmd fixes that but adds a little cost.
Best thing is to play any of these games as often as you can. No need to rush into buying anything. Figure out some rules and see what you like or don't like. My tastes have changed a whole lot since I started getting into pinball. Some games I thought I loved but after getting some decent playtime, I don't like them as much. Some games I never thought I would like are now sitting in my gameroom. All new games are exciting and fun. The games you want to buy are the games you still enjoy playing long after that newness wears off.