Well, for what it's worth the introductory experience that the current trial account offers is the same deal, and all it does is limit certain forms of communication that are normally abused by spammers; actualy in-game chat with other live people still exists, but in certain channels (local, for example). Likewise, because of the leveling mechanic for guilds I can see why they restrict that feature as well. This is still a limited-feature trial run, even if they removed the 14-day restriction. Unfortunately, I don't think that you're the guy this is aimed at; there are plenty of MMOs out there with no restrictions and a F2P model that supports what you're contending would open this up for you, but WoW is still designed as a pay-to-play model and they need to make sure there's an incentive to subscribe. It sounds like you really just wanted unlimited level 1-20 F2P and at this point I doubt you'd subscribe anyway if you're not willing to even give the existing trial a shot; I don't fault you, though; this game may cost only a small amount per month, but if you end up playing for years as so many have, it can add up over time. There are plenty of F2P MMOs out there that are decent experiences without necessary buy in that you really should investigate (i.e DDO, LTRO, Champions Online and more to come I am sure).
Aside from that, I feel obliged to point out that the cost fo entry is more like $20, with the battle chest on Amazon which includes the core game and the first two expansions, then another $30 for Cataclysm (although the core game includes all the level 1-60 Cataclysm revised content, fyi). So $50 right now for ownership of the whole game, plus the $15 sub fee is more correct.