I personally feel that Gimli shouldn't be a summonable from Legolas. The main reason for that is that Gimli is already in 2 factions (Dwarves, And Rohan as a summon.) Assuming that Imladris keeps its Council of Elrond power, which if I remember correctly, can summon Gimli, then that's 3 factions already. If he is added to Lothlorien as well, then every good faction besides Gondor/Arnor has Gimli in some way. Isn't that too much?
Nothing against Gimli, in fact he is one of my favorite characters, but in my opinion he shouldn't be in that many factions.
Also, I feel that Legolas, as a very skilled archer, should have his Train Archers ability, despite his role as a hero. But like I said a few posts ago, maybe it should have another effect on top of giving exp.