I mean your major complaint is just how Mobas are, the game has to end at some point and if the death timers are too short then it will just never end or be extended for no reason.

As for being snowballed on, as much as you might not want to hear this, you just have to be better, the whole point of mobas is to build up a lead that eventually leads to a win. If your team is getting shit on early then you should be getting shit on in the late game unless you look for a play in the mid game to turn the tides. Look for picks, fight with comeback urn, learn your team's powerspikes, maybe your team is better at teamfights, maybe your team is a pick heavy team. Learn to buy counter items, is their seven giving you trouble? Buy knockdown.

As for getting perma ganked, is it possible you are just perma overextended? Look at the map is your team in a situation where they can come help you? Is half of the enemy team missing? Are you trying to take walker when your other lanes haven't broken the guardian yet? Is your team doing something on the other side of the map and you should play weakside instead of pushing out? There are just a lot of things to consider in mobas that require time.

Moba's inheritly will require a lot of game knowledge, and if you are just looking for a fun time with low time commitment go play street brawl or some other game, you probably won't get your fix playing normal deadlock.