Warframe:
+ geat combat and fast movement
+ freedom of movement, jumping, gliding, flying (parkour is just the best in all games I played so far imo)
+ 3rd-person-pve-coop-shooter with some (but not too much) roleplay elements
+ big variety of Warframes (= something like battle suits) and weapons
+ encourages experimenting with different gear
+ you can progress and obtain all things with one single character/account
+ unique and consistent art design
+ plenty of gorgeous looking cosmetics and design options ("Fashion Frame")
+ mostly fair monetization and ingame market
+ great graphics and running smoothly even on older machines
+ game had a "small" start, but got steadily better and bigger over the course of the past years
+ epic big boss battle ("Teralyst Hunt") added with the last expansion
- no open world, heavily instanced (new big Plains of Eidolon map is just another instance)
- only 4 persons at a time can run an instance (8 in a raid)
- no dynamic map events
- grind gets repetitive fast
- pvp is atrocious (but I don't really care about pvp in general with the exception of Planetside 2)
Guild Wars 2:
+ world is just beautiful
+ dynamic map events, some can be started by the players
+ maps can host plenty of players for zerging events
+ great and helpful pve community
+ player characters/professions are not bound to a specific role (no "holy trinity" here)
- world is still instanced (big instances but still instances)
- combat is more dynamic than in other wow-style games but it is still wow style
- fun and efficient professions will get nerfed to boredom sooner or later
- abhorrent grind and stupid tasks for obtaining exalted and legendary gear
- movement too slow (got better with the introduction of mounts)
- jump puzzles (highly subjective but I hate them)
- more and more immersion breaking silly stuff sold in the ingame market
- quality-of-life features and rng loot-boxes sold for real money in the ingame market (just don't do that, it's a no-go!)
Planetside 2 (only a few times a year now)
+ BIIIIIG and beautiful continents, almost open world
+ dynamic endless fight for global domination
+ Epic battles with mechanized infantry, tank columns, air battles and sieges, all player driven
+ truly deserves the tag "massive multiplayer"
+ Player can set up custom spawn points for their side (spawn beacons, "Sunderer" and "Galaxy" troop transports)
+ primarily a shooter with some roleplay elements (progression via "certs")
+ all roles/suits/vehicles/loadouts available with one character
+ it's not only big, it also has intriguing mechanics and depth of play
- only pvp, no pve
- only 1st-person
- not very beginner friendly, newbies get lost quickly
- long and boring grind for "certs"
- character is faction and server bound
- the horn for your vehicle is sold separately in the real cash market (Honestly, are you kidding me?! Honk if you got horny looking at my purse! Not even German car manufacturers sell their cars without the horns...)
- dwindling population with too many "no-lifers" left in the community