Combat in Marvel Heroes will appeal to classic Diablo fans. The left mouse button is primarily used for movement, attacks, and other environmental interactions. It's easy to pick up, even for those without much experience. Given the game's free-to-play nature, the user-friendliness benefits it greatly. Unfortunately, there is currently no controller support. Given that there are only six designated attacks (eight, if you count the two mouse buttons), it feels like Marvel Heroes could have worked well with a gamepad option.
Level design is structured like most dungeon-crawlers, with aforementioned overworlds that feature servers filled with heroes and more closed-off mission areas that only include the player and four other random users. With the combat so easy to understand, there was little communication needed. Everyone seemed to know to simply fire away at anything that moves and that if anyone had a purple cloud over their head, they probably needed to be resurrected. Everyone received their own loot, though anyone was free to picked up anything dropped by a player. Because of that and because of the lack of communication, Marvel Heroes felt like much more of a solo experience. In fact, I barely communicated with anyone during all my time with the game. In some ways, I actually enjoyed the solo MMO experience more.
Where Marvel Heroes' level design falls short is in its lack of clear directions. Many of the levels in the game are fairly large and finding the next story point can get aggravating. A question mark will appear if you get close enough, but other than that, you're flying blind and it becomes very easy to get lost. At one point, I was asked to infiltrate a Purifier training camp within Fort Stryker. Unfortunately, I was never told where the training camp was and I wound up completely running in the wrong direction. At this point in the game (with my Hawkeye at level 16), enemies began spawning by the dozen and hitting a dead end meant assured death. A half-decent waypoint system would have been a godsend.
A diverse roster leads to some interesting team-ups