Two points here.
One, the idea that Goldeneye Source is a "remaster". A remaster is an existing game that has been given enhancements such as better graphics, better controls, or added online play, but is still basically the same game. Examples of this include Conker: Live & Reloaded, Wind Waker HD, and the upcoming Skyrim Special Edition.
This is different from a port, which is the same game on a different platform, possibly with better/worse performance and other small changes.
A remake is an old game rebuilt from the ground up with entirely new graphics, a new engine, etc., but still sharing major features such as story and level layouts. See Final Fantasy VII Remake or
some 3D versions of classic 2D games.Goldeneye Source is a new game based on an old game. Let's call it a semi-remake. It borrows level layouts, characters, and weapons, but the engine, movement, and some of the sounds are completely different, and there's no missions. It's a from-scratch Half-Life 2 mod, not an upgraded N64 game. If all you liked about Goldeneye 64 was the fact it was based on the James Bond movie of the same name, then you'll probably consider this the bee's knees, and maybe the
other semi-remakes too.
Second, emulating Goldeneye 64. Yes, it's
close to the original. In fact, it's better in some ways. But high-level emulation (HLE) of N64 games is not exact. Common faults include choppy audio, too-fast animations, inaccurate particle effects/alpha blending/gamma, inaccurate controls, missing effects, frequent crashes, and so on. Netplay adds more problems, as the two most popular netplay-enabled N64 emulators are out-of-date, and since games without built-in online play can't have complex lag compensation, you need really good connections.
If you're cool with all that, good for you. But for me, until CEN64 is finished, playing GE and PD on an emulator is an inferior experience to playing them on an N64.
You call this nitpicking, I call it being accurate.