I thought that might be what you were going for, but I don't know why you said it... the Beguiler is already ranked, and I've in fact played both as and with one multiple times. They're a very solid class, quite good at what they do (namely, fill the skillmonkey role while still providing very useful combat support). They're not gamebreaking though (unless you throw in SCM or something). That's why they're Tier 3. So what was the point? Why try to obfuscate things to ask about an already ranked class?
Remember, Tier 3 doesn't mean it's bad in any way. In fact, it means it's very good at what it does... just not in a game breaking sort of way. Sure, spamming Glitterdust is very effective, but it's not actually gamebreaking. Meanwhile, a Sorcerer can easily pick one of the two spells you've listed at every level and still throw in the really game breaking spells too, which is why it's Tier 2. And certainly, the Beguiler doesn't get any downtime utility spells on par with Planar Binding, PAO, or really even Teleport.
JaronK this is a joke. When presented with the Beguiler's combat spell list you and another poster said that if he had out of combat utility he would be on par with the Sorcerer. We know the Beguiler has utility.
Now you whine about obfuscation, even though the reason is obvious. Beguilers are Tier 2. But if we ask, "Beguiler" you say Tier 3. If we ask "Combat spell list, plus assume utility" you say with utility Tier 2.
Then you move to hide behind your ridiculous "gamebreaking" logic. People don't break the game. No one has ever in the history of D&D played a broken game. Polymorph doesn't need to break the game, just like using Dominate Person and Dominate Monster doesn't need to break the game. But yes, having a giant following of characters and monsters that are your bitch and individually have the same CR as you is enough to qualify for breaking the game.
You have some sort of obsession with maximum bullshit potential. You even pointed to Sorcerers being able to Shadowcraft Mage as one of the reasons they are better than this fictional class that turns about to be Beguiler, one of the 3 Shadowcraft Mage base entries.
Wizards aren't Tier 1 because they can Wish loop, or because they can Polymorph Any Object, or because they can break the game eight other ways. They are Tier 1 because they are a really good class that can do all sorts of non game breaking things at once. Sorcerers are Tier 2 because they can do one or two of those non gamebreaking things. You know who else can do one or two of those non gamebreaking things? Beguilers.
Dread Necromancers can actually become Pun Pun without resorting to Pazuzu. They have a class ability at level 12 called, "Win D&D". Maximum breakage potential isn't important.
A Beguiler can spend a couple feats on Arcane Disciple Rune and Renewal Domains and be able to PAO and Planar Bind, and get a crap ton of useful spells besides. He can spend two feats to design his own domain and pick one "gamebreaking" spell per spell level. He can make it the fucking Polymorph Domain that gives Alter Self, Polymorph, Draconic Polymorph, Polymorph Any Object, Shapechange, and fill the gaps with crappy Aspect spells starting with Aspect of the Wolf at level 1, and working up.
Heck, he can just buy a Runestaff of Magic Circle, Dimensional Anchor, and Planar Binding and call it "Staff of Efreeti's Wishes" and recoup the cost of the item in a pile of gold. And that's not even getting into Wishing for items.
Breaking D&D is not hard. It is pathetically easy. If your Tier system measures nothing more than game breaking potential or ease, please admit that so that we can all ignore you. Also reduce it to Tier 1, 2, 3. One is those that can cast spells and Efreet wish themselves. 2 is those that have UMD as a class skill. 3 is those that can't do either. If it on the other hand measures actual games of D&D that don't break, you can then have a series of tiers that represent approximate non broken game potential, and that can explain why Sorcerers who can break the game faster easier and better are lower Tier than Clerics and Druids who are better when the game is not broken, but harder to break.