Text in Motion
Here's an example of some text created in Motion for use in a Final Cut Pro sequence. Since this Final Cut project uses DV footage, the Motion project is set to DV. In Motion, the text looks nice and crisp.

 
Text in Final Cut Pro
Here's the same text, after importing the Motion project final into Final Cut Pro, and dropping into a sequence. Notice how jagged the text has become. What happened?

 
Why your text looks bad: reason #1
Because you are looking at FCP's Canvas.

That's right. If your program is an DV program that is intended to be viewed on a television set, then the only way you can judge the quality of your video is by viewing it on a monitor - preferably a calibrated monitor at that. Interlace flicker, title safe, and color space: these issue can only be accurately assessed on a monitor.

 
Why your text looks bad: reason #2
Because you are looking at FCP's Canvas.

Okay, that sounds like reason #1, but stay with me here. You see, by default, the Canvas is only showing one field of your video - and in DV, every frame has two fields - so you are only seeing half the lines of resolution.

Plus, the Canvas is scaling your video to account for the difference between square computer pixels and the non-square pixels of DV video.

Both of these factors combined can make your text, which may look good on a monitor or on export, look terrible in FCP.

Here's how to get a better sense of what your text really looks like, even if you don't have a monitor:

 
Accurately evaluating text in the Canvas

 
To view both fields in the Canvas, click the first of the three pop-up menus at the top of the Canvas window and change the size to 100%. Then, select the "Correct for Aspect Ratio" menu item to uncheck it.

With the Canvas set to 100%, you now see both fields. And with Correct for Aspect Ratio turned off, FCP isn't doing any scaling.

The text won't look quite exactly like final output because it's no longer being scaled, but as you can see, it's now as crisp and clean as it was in Motion. Note that while this is helpful, the Canvas still won't reveal interlace flickering, especially on animated text - again, a monitor is crucial.

After checking it out, I recommend turning Correct for Aspect Ratio back on - so you get an accurate view of your text's proportions. I would als set the Canvas to Fit to Window, in order to make sure you see the whole Canvas and to improve playback performance.

 
Why your text looks bad: reason #3
Because you are using the DV codec.

Even if you use an external calibrated monitor or make these adjustments to the Canvas, your text still might look worse in Final Cut Pro than it did in Motion. If you are adding the text to some DV video in a DV sequence, it will get rendered to the DV codec. And while the DV codec is good for video, it's not so great for text.

What to do? Use a large, sans serif font. Fine lines, especially horizontal ones, are going to look bad. Partly due to the DV codec, but even more so due to the interlaced nature of NTSC or PAL television - an issue you cannot see in the Canvas.

 
What if you are only going to the web?
If your end product will only be viewed on the web, then you don't need an external monitor - the Canvas with the adjustments above should work just fine. You will probably want to deinterlace your video when you compress it for the web to eliminate any interlace artifacts.

The good news with going to the web is that, even though you may be working in a DV sequence, when you export, your titles will be compressed directly to your chosen codec, and not be destroyed by the DV codec. In order for this to work correctly, you need to watch out for a couple of things:

1) First, make sure you are using a Motion project in FCP, or exporting out of Motion with the Animation codec. If you export from Motion as DV (to avoid rendering again in FCP), you have crunched your text into the DV codec, and then it will get further compressed into your web codec.

2) In FCP, choose to export using Compressor or to Quicktime conversion - do not first export a self-contained or reference movie with the current settings, and bring that into Compressor. If you do, you'll just once again put your text through the DV codec before compressing for the web.

A few other tips
For the best possible text, you may also want to check the following:

1) In Motion, set the Render Quality to Best. This is important particularly if you are moving the text close to the camera in 3D or scaling it up very large.

 
2) If you are going straight to the web, in Motion's Project Properties, set the Field Order to None.

 
3) In FCP, in the Render Control tab of User Preferences, make sure that the Always Use Best Quality When Rendering Movies checkbox is checked (it is by defaul).

 
I hope these tips will save you some frustration next time you create some nice titles in Motion for your Final Cut Pro project.

If you want to learn how to get the most out of Motion, please check out my Motion 3 Fast Forward and Motion 3 Deep Dive tutorials from Ripple Training.