Well, you don't really have a great answer to t-tar. Latios would make it worse, Deoxys can at least check T-tar with superpower but obviously it can't switch in. Excadrill goes down to T-tar's superpower or earthquake but can't OHKO with its own earthquake in return. If your rotom is physically defensive though, that could come in, tank a hit, and burn it, which is both residual damage and of course turns T-tars OHKOs (like E/Q on Exca) into 2HKOs.
Defog is usually more desirable due to being un-blockable and you don't have to make contact with the opponent (so no iron barbs damage, for example), but that doesn't make rapid spinning bad or unviable (it actually has the advantage of not being affected by taunt and not doubling Bisharp's attack for it). If that works better for your team, go for it, especially with something like Excadrill that deals pretty well with the most-used ghosts in the game, Gengar and Aegislash. Although, it only deals with Gengar if 1) you predict the switch in and go for earthquake, or 2) Gengar does not have or misses focus blast, and like I said in my last post, if Aegislash carries the air balloon, you have to hit it with shadow claw or whatever first giving it a chance to sacred sword you (if it carries it). Despite that, I'd say Excadrill is probably the best rapid spinner in the game.