Warframe has a very large story base with lots of hidden lore. That is, if you ever want to stop and smell the roses instead of slamming through hordes of enemies, completing challenging jumping puzzles, doing endless roaming expeditions on a number of planets, or getting distracted by trying to unlock every single playable level.

Do note, all of this can be done without paying a single penny.
Have I payed anything? Why, yes. Because I love this game and wish to continue to support the developers! Did it really give me an edge in the game? Not exactly. There are still items you are required to do missions to obtain to become stronger and hit enemies harder. Throwing money at the game may help, but the best things are earned.

But what is the best weapon? There may be some weapons that have more damage, but that does not make it the best! And that is jsut a fraction of why this game can absorb all of your time. It's a style-play kind of game. Pick a type of Warframe you like. It's not quite one of those typical RPG's where you have healers, tanks, and damage-per-second classes, but there are Warframes that can fill those roles, and so much more. And if you ever feel lost, there are moderators online often, and even veteran players, that will guide you through any process! I would highly recommend joining a clan, for the sake of surviving hard quests, and having even more fun with players that may have 'broken' builds. And oh my goodness, there are some broken Warframe builds. And it's fun. The developers are also always coming out with a new warframe at least once a year or so. And then they rotate more powerful gear to grind for in certain quests. Thus, giving something new to do if you have done everything (which is not impossible, but i have over 600 hours, and I maybe have about 40% completion...)

#inarosforever
I love being a tank. Inaros just happens to be a warframe that only has health, no shields, and can steal life on certain melee kills. However, his quest to build him took FOREVER (like a week, really).

This variety of things you can do can be overwhelming, but sometimes you just have to take the dive and try it. The developers have listened to the community and evolved the game over the years to become something far better than originally planned.

And I haven't even touched on the visuals. The designers have done so well with building unique environments and character models. Is everything flawless? No, but gosh they get close!

I do not regret any payment or time lost in playing this beautiful game.

Join us, Tenno.