These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Air Mech
Game Breaker: fortifying any given zone with enough Seekers can basically deny that zone to the enemy team: until later levels, they simply won't have the Hit Points to withstand that kind of Anti AirMacross Missile Massacre. One option is to airdrop ground units, which Seekers can't shoot... but what if they're on an island? (On a more positive note, Seeker saturation can also help shut down the "leaving a tank on your porch" tactic the Co-Op Multiplayer AI seems to so enjoy.)
Goddamned Bats: A small example : When you're transforming to ground mode so you can pummel AI when it's supporting their units during said "leaving a tank on your porch" tactic, it goes back up and fly away just as you're about to fire.
So Cool It's Awesome: A fantastic blend of RTS and action games, with many different playstyles being equally fun, rewarding, and useful, and a Free-to-play system that averts Bribing Your Way to VictoryandCrack is Cheaper? You better believe it. As an added bonus, if you refer enough people to the game, you get increasingly awesome rewards—the highest ones involve you designing your own airmech, skin, unit, and characters with the developers, which then becomes part of the game. And the developers themselves: Husky Starcraft stumbled onto the game, loved it, did a quick demonstration of the game on his channel, and then did a 3v3 game with 5 of his fans. A bunch of people (including hardcore Starcraft2 and RTS fans) posted feedback on the game, started playing it themselves, and wrote some more feedback. The developers looked at this feedback and released a couple patches to incorporate it. All in the same day.