Oh, where do I start? I love this game! For all the flak it gets, it's a stable, and frankly, fun Transformers title. Despite what everyone says, the visuals look exactly like Fall of Cybertron, which creates some very beautiful character models and locations. Locations like Cybertron's "Sea of Rust", or Kolkular (Megatron's fortress), are beautiful to look at, especially with the upgraded visuals on PC.
The campaign mode's plot is the least enjoyable in terms of story, as it breaks canon in many areas (Such as Optimus and Grimlock's partnership in the game's 13th mission, despite the game being a prequel to Age of Extinction), which nagged on my mind a lot. Besides this break in continuity, it's rather enjoyable, however, I just wish it was focused more on Earth, as over half of the game takes place on Cybertron, which wasn't in my interests with an Earth-marketed game.
Sound design remains the same as Fall, with most of the original voice actors present to fill their roles in game (i.e: Peter Cullen as Optimus, Fred Tatasciore returns as the Aligned Continuity Megatron, while Jim Ward lends his voice to the Insecticon, Hardshell. This attention to voice detailing leaves you immersed in their voices and dialogue. Weapons sound beefy, and hold impact, with my favorite sound to hear, being one of the "Gambler" upgrade for the Path Blaster (Gambler being an upgrade that makes the final shot in the chamber have the destruction potential of a small nuke, while the Path Blaster is a single shot, semi-automatic rifle.)
Level design in this case is never actually "repetitive", as the levels retain the brightness and color from Fall, while giving more varied areas to explore, ranging from a massive "desert-esque" land, a city at dark, and a massive alien fortress, etc. This keeps each area fresh, while also smoothly changing from level to level. The gametype Escalation (A horde-type mode, where players fight off increasingly difficult waves of enemies) is beefed up in RoTDS, as there is not only a healthy amount of maps; but a multitude of upgrades to certain map areas. (Ranging from Corrosive fields, to turrets, and even electric barriers.)
This also goes hand in hand with the amount of playable characters, which is massive, even for a Transformers title. However, most of the characters are Cybertron based, while only about 4-5 are Earth-based, (Drift, Bumblebee, Optimus, Lockdown and Stinger, if you bought DLC) which might leave some players desiring more in the way of Earth modes.
Also, multiplayer is absent in this case, although, Escalation is cooperative. This may not affect people who are campaign lovers, but people who play games for multiplayer need not apply here. Overall, this title shouldn't be treated as a full on, new title. It should be treated as a massive expansion. It's a fun, if not short ride that is well worth the money. I'd recommend it.