If you are reading this review with the intent of downloading the game, read this: Warframe is a really fun game. I am a new player, only level 14 for my Warframe (about 8 hours playtime) and I love the quest types, the unique "levels" and how smooth the gameplay is. The abilities are also interesting in a unique way. The ability to upgrade your weapons with cards that have varying DMG, Health, etc multipliers is really nice. Being able to play with people online to help you beat the harder missions can allow you to find new people to play with, or simply get better rewards for surviving longer / completing more objectives.
Things I dislike: controls are a bit unintuitive compared to the standard fight, movement keys in other games. For PC switch weapon is F, E is to Melee and X is to interact. Overall though, only took me maybe an hour or 2 to get used to it.
There is a steep learning curve. I am 8 hours in (not very long I might add) but there is still so many terms and items that I have never heard of , but thats to be expected. Additionally, the prequisites are a bit difficult to understand as a nooby so some googling may be in order to help you find out how to unlick a certain thing to progress to a locked misson.
Overall, good game and I look forward to grinding it out even more.