The doom 3 source code release is great and the engine is still neat - BUT, I think I would not use it for something I'd go commercial with, simply because of the GPLs restrictions (obligation to make the products source code available). For free stuff though I think it's (about) perfect . . . but then again: for free stuff you also don't have to pay a single dime to Epic/CryTek/Unity Technologies . . . so they probably aren't any worse in that regard.
Overall I think the choice of engine is -as often- depending on application, your (team's) experience and personal preference, therefore a concluding: meh.
Sghirαtë
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