Cyke's powers are actually a lot more devastating than Wolverine's, if you think about it. Wolverine has to get in close. Cyke can just zap them from afar.
If they'd written something for Cyke to, I don't know, do... particularly in the first movie... ahem. Well, things might've been different.
I don't think it's how the character was directed or acted that bothers anyone. It's how he was written. Or rather, NOT written. Think about it. Exactly when did Cyke ever use his powers? He gets his visor knocked off, then he gets brainwashed to attack the woman he loves, then he cries about the latter like a little wuss (in the average moviegoing public's eyes, not mine). Wolverine gets into big fight sequences with Mystique and Sabretooth and Lady Deathstrike and leagues of human forces; Cyke gets taken out like a harmless kitten when he even does have something to do, and THAT is why Wolverine got all the love--because he was written as a badass who got to use his abilities all the mothertrucking time, and America loves a badass. In fact, America WORSHIPS the badass. That's why Arnold Schwarzeneggar is a governor. If Cyke had been a badass too, at least more overtly, then he would've been loved as well, regardless of anything else.
But for some utterly stupid reason, only Wolverine gets anything to do. It's not about a team interacting so much as it is about Wolverine kicking ass while the team supports him. That's one thing X3 did right--other characters besides Wolverine now and then managed to look like badasses, too (mostly Beast). Although Wolverine still got way too much screen time, particularly since Hugh Jackman was coasting this time. I don't get the sense he really gives a damn anymore, honestly.
And before someone accuses me, I'll freely admit it; yeah, I'm bitter, pissed off, and annoyed. I liked all three movies, but I get so bored of Wolverine and all the stupid clawfight sequences. X-Men should be about more than that. FFS, he's already getting his own movie, why the hell does he need to be the focus of the other films, too? The character is a jerk and his regeneration is boring; it doesn't fill me with wonder or curiosity about the potential and the limits like Jean's, Storm's, Cyke's, Xavier's, Magneto's, Rogue's, Kitty's, Pyro's, Iceman's, etc. Wolverine is so... common. He's your typical action hero badass jerk.
How much better would that whole sequence with the Brotherhood have been if it had been a TEAM which got chased off instead of just Wolverine? In my opinion, a LOT.
Despite what it may sound like, I don't even hate the character. I just hate the way everyone in Hollywood seems so bloody eager to suck Wolverine's... adamantium. I'm tired of it. Wolverine is most interesting when he's an actual part of a team (which does happen very occasionally), not standing in the limelight making muscles for the ladies and clawing generic bad guys for the dudes.
These scriptwriters have done some great things, but when it comes to actual decision-making... rotten. Just awful. If that's the best they can do, give it to somebody who knows what's up, for once. Or if I'm placing the blame in the wrong spot, then let's fire whatever *******s at Fox came up with this shiznit and hire some people who have a damn clue.