You should find a place to play the different games as rob said. Cause you have to find out what kind of games you like.
Some are more like a journey with quests. Others are basically more oriented towards fulfilling objects-things.
Some are a little friendlier for beginners and some kick your butt right away.
From the games you listed
JJP GnR --> not played yet. Looks interesting.
Stern Avengers Infinity Quest --> Loves this game. Nice flow and superb "Ramp-action". Easier then JP2.
Stern TMNT --> A hard, fast and addicting game. It has the "one more game feeling", but not sure how it works in a two pin collection.
Stern Jurassic Park --> A deep game with a lot to do. Has a lot of stuff going on.
Stern Star Wars --> Fast game with a pretty neat rulesheet and cool missions.
All these games are quite good and offer a lot.