Not to pick on Wicht here, but I wouldn't mind some concrete examples of how my game is served better with Pathfinder.
Now, to play Devil's Advocate
1.) You will have a publisher supporting your system of choice
So? I have 8 years worth of support for my 3.5 game, and more stuff than I'll ever use there. Not to mention a pretty through back-catalogue of 3pp stuff like Necromancer and Goodman modules. Aside from modules, I'll probably need nothing again. I certainly don't need another copy of the core rules (3.0, 3.5) unless that's bettering my game.
2.) Using your 3.5 material with PFRPG is still a viable option
How much so? Will combining Reserve Feats [Comp. Mage] and Alternate Class abilities [PHB2 & others] Absolutely BREAK the balance of power Paizo tried to accomplish? What about a modules written under 3.5 (or 3.0), can I assume these new uber-PCs (with all thier kewl new toys) are still going to be challenged, or will they cakewalk through the unmodified monsters (which will necessitate the purchase of Pathfinder Beasitary to up the arms-war on the monster side?)
3.) The sorceror finally stands out as something other than a "wizard for dummies."
How so? More spells? Better combat ability?
4.) The Cleric Domains are evocative
But are they balanced? And what if I want to use domains NOT in Pathfinder (like Charm, Cold, or Moon?) How will they stack against cleric domains in PF, or am I stuck waiting for Pathfinder-compatible versions of these domains?
5.) Barbarian Rage Powers made me want to try playing a barbarian
4e made we want to try playing a monk, but that's a poor reason to buy a ruleset. How is the barbarian fixed? What was broken before on it? (I was under the assumption Barbarian was one of the few "unbroken" classes in 3e)
6.) The book is beautiful
Art/Shmart. I don't need pretty pictures at my gametable, I need functional rules.
7.) Fighters get armor bonuses that other classes don't get
See, this helps me a bit. It lets me know fighters aren't going to get slapped around as much in combat.
8.) You will be supporting a publisher who is supporting your 3e books (and your system of choice)
Again, I played 2e with one of my DMs until 2003. Publisher support is a non-issue to me; do the rules make my game better, easier, and more fullfilling or do they make it longer, more confusing and needlessly complex?
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Let me give you an example here.
My 1st level D&D party consists of...
A human fighter (bastard sword + shield). What's he gonna get for upgrading?
A human cleric (domains war and courage [CW]) who is a melee cleric. What's her advantages?
A human wizard (specializing in shadow/illusions, but not a specialist) How is he going to benefit.
A Halfling rogue (archer/trapfinder) What's she got to look forward to?
A Homebrewed Feyrace Warlock (Neither are supported in Pathfinder, is he gonna get left behind?)