All depends on the bike and it's overal functional condition. If it's a salvage title Yamaha R1, then no, it's not a good beginner bike. The title is the only real thing that reflects a bike is salvage/reconstructed. It doesn't make it worse or better to learn to ride on.
Some are scared of salvage title bikes, some are not. All depends on your outlook on a m/c. The salvage title definitely brings the value of the m/c down. If the bike has been completely repaired to like new again, then the bike is just as good as new.