In many respects the LOTRO UI is identical to DDO's it seems based off the same engine hooks, however the LOTRO UI can be moved around, and customized to a degree that DDO players can only dream of. You can even determine where on the screen pop up info pops up, and it will pop up there until you move it. The bag/pack inventory is very similar but not as primitive as DDO. You can also tweak the transparency of UI windows. Place where they show up permanently (imagine every time you open the bank and your inventory in DDO they all show up exactly the same location so you don't need to move your inventory off of the bank window because one is always overlapping the other for no good reason) You can scale things bigger and smaller (imagine being able to make your hot bars bigger! I play in 1900x wide screen res so I would love this...)... You also don't have Eleventy Billion identical icons for different items in LOTRO... in other words LOTRO actually replaced their Beta place holder graphics with a large variety of icons for the same kinds of equipment.... DDO has a red cloak and silver greenish bracers for almost every cloak or bracer in the game... DDO has one grey pair of boots and one green (besides the odd named item). That's just so unpolished that it's embarrassing.
Anyway all of this is just a long way of saying your <air quotes> "friend" </air quotes> doesn't seem to know what he or she is talking about and probably should be disregarded as a source of useful information from now on