I completely agree that there needs to be someway to complete those missions if you are considered more of a solo player.
I also have an issue in general with the group finder. I was in a HM lvl55 flashpoint where we were doing well on the trash and made it to the first boss. Upon attempting the boss the group members died(Mand. Raiders), because the healer was not actually geared for the flashpoint. After the healer was called out by one of the dps for not being geared the dps left, leaving three of us in, the healer then noted that he wasn't sure about his gear but was going to go work on it to ensure that he could complete the mission. After the healer bailed the last dps said he was going to go help( one dps and the healer were friends ) leaving me alone in the flashpoint unable to continue without a reset because the boss was not killed ( i could not que because trash had been killed) upon leaving and resetting the flashpoint and re-entering the que, I was dropped into an entirely different HM. WTH?!? If I had to go through all the trouble of stepping out and resetting to reque only to wind up in an entirely different HM why not just let me que anywhere?
Also if you're going to have a suggested rating...why not go the next step and not make it available until that rating is achieved, the idea of allowing people to decide anything for themselves will only waste time of others who are prepared.