Warframe as a game is always changing and evolving. Two major examples that I have personally played through are the U22.12 weapon overhaul, and the U27.2 Warframe Revised update. Unfortunately for a sporadic content creator like myself, this means that my content is made redundant over time, and I don't have the time to update everything. As such, please take note of the version at the time of each review's latest update.
Mesa is a gunslinger-themed Warframe, released back in U15.5. Mesa Prime was recently released alongside Akjagara and Redeemer Primes, in U24.2.2. Despite Mesa's relatively more difficult grind, she is an extremely popular and very powerful Warframe.
