Lanefan
Victoria Rules
To say your system has no drawbacks or negative aspects is I think naive at best and disingenuous at worst.By "drawbacks" do we mean "bad things"? In that case, I can't say I've encountered any.
If we're talking about weaknesses in particular systems, well that's a different topic. 4e has well-known issues about the interface between combat and non-combat resolution.
If we're talking about challenges for or demands on participants, that's a different thing too. MHRP/Cortex Heroic puts a lot of pressure on the GM to manage the Doom Pool effectively, which is often not easy to do at all. BW is demanding on players, because (i) it asks them to give so much to the game, and (ii) a lot of the time it punches them in the gut as a reward for that giving. But I wouldn't call this a "drawback" - it's the system doing exactly what it says on the tin!
So, I don't know of any general disadvantages to running a game in which the action and the focus of the shared fiction has its origin with the players' choices for their PCs. Unless one doesn't want to run such a game. But that's not really a "drawback", so much as a mismatch of methods with preferences. [MENTION=6696971]Manbearcat[/MENTION] gives an example of this with respect to B/X. I ran a session of AD&D fairly recently, using random dungeon generation, and obviously that's a very different thing - but I ended up reaching the following conclusion:
So, as I said, no drawbacks for my group.
I mean, we can probably all say our various systems have no drawbacks for our own groups, if we put the rose-coloured glasses on; but the question was being asked* on a higher level than that: what are the potential downsides to your system overall.
* - I think, as I'm not the one who originally asked it.
Lanefan