1st hour playing: WHAT DO I DO WHY IS IT BLOWING UP
400th hour playing: If my calculations serve me right with this T/W ratio It will take me 1 minute 43 seconds to burn at my periapsis to reach duna insertion at which point I will get into an eliptical equatoral orbit and perform an aerobrake at 16km to get into a steady circular orbit and then I will descend with one of my 4 spaceplanes I took to go to the north pole at which I will set up base at my already existing rover while getting TAC resources to monitor life support and make sure my colony of 212 kerbals can live.
Edit because for some reason this gained popularity, proper review:
Endless fun, so much to do. Bored of building rockets? Build a space plane! Fed up of the mun? Go to Duna! Don't want to leave the atmosphere? Build whatever you want! The list goes on!
Fantastic modding community and fantastic mods. So much more expansion on an already amazing game.
Fantastic community in general, some of the nicest people I've met have came from this game. They are such a helpful bunch and I'm glad I'm with them! They'll most likely love to help you. There's also a bunch of fantastic YouTubers such as Scott Manley and others... (too many to name) :)
YOU CAN LEARN STUFF FROM THIS AND GAIN NEW INTERESTS! Before I played this I had no interest in space or space exploration whatsoever but now I actively follow space news and am quite knowledgable on the subject. I have also learnt a fantastic deal of orbital mechanics just from playing and learning the game.
The engine and optimisation. This game uses Unity and it only uses 1 CPU core. This can be a major problem if running a multicore with low clock speed. The 32bit version of the game is a whole lot more stable but limits your RAM meaning that if you have a ton of mods you can run into a lot of crashes but thankfully there are mods out there such as ATM (Active Texture Management) and texture replacer to limit the amount of RAM the game uses. 64bit as of now is still pretty unstable with mods.
The learning curve and tutorials. The learning curve on this game is huge, I'm not complaining much about this one as rocket science isn't exactly easy is it? You can learn from trial and error and it's how I learnt alot but some things you just have to read up about or watch a tutorial on youtube. There isn't really much of a tutorial in game either.
Conclusion: Buy it. It's really fantastic.