Ya the missions for Romulan marks suck. Mine Trap is the only one I have fun with assuming the game is full and does not have a lot of leechers in it. The Vault is also OK but if your team is unable to successfully complete it you get nothing and the rewards should be a little higher as most of them should be.
I don't understand your problem with getting Rommie Marks... I get even 150 every 2 days, and it takes me a bit over 10 minutes.
Pick up Tau Dewa sector patrol, leave it for 20 hours (so that cooldown runs out before you actually do it). Then wait some more for Reputation Event (that sweet 1 happy hour). Then just do Nequencia trading game 5 times (takes me about 6 minutes), cash in for 75 marks, and since you had mission in your wallet for 20 hours or more, cooldown is not an issue. Then pick it up again immediately, do the Nequencia dance 5 more times, cash in for another 75 marks, and go somewhere else for 20 hours till cooldown ends.
Rinse and repeat.
May 2013, automatic permanent ban for mentioning gold-seller sites pwebranflakes: this system is currently in place and working the way it should. moradum: I got banned for saying "I started my day with cutting off 3 MM off of the bottom of my cabinet"
Romulan Marks are considerably easier to come by than Omega Marks, in terms of "effort required".
Just the patrol daily and Epohh tagging give truckloads for a few minutes of effort.
"Don't let them promote you. Don't let them transfer you. Don't let them do anything that takes you off the bridge of that ship, because while you're there... you can make a difference." - James T. Kirk